PrivateAssets = All does not prevent the dependency from flowing to another project

### Steps to reproduce

I have two projects:

Project UITests:
```xml

net472



All

```

Project Rollup:
```xml

net472

```

The only code file is Class1.cs in UITests:
```csharp
namespace UITests
{
class Class1
{
}
}
```

The solution file is:
```
Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 15
VisualStudioVersion = 15.0.28307.136
MinimumVisualStudioVersion = 10.0.40219.1
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "UITests", "UITests\UITests.csproj", "{47EF8446-D7D9-4B15-A170-BABBB5E5A30F}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Rollup", "Rollup\Rollup.csproj", "{9758E8DF-CB3E-46CE-B4E2-98B1D51651D6}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{47EF8446-D7D9-4B15-A170-BABBB5E5A30F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{47EF8446-D7D9-4B15-A170-BABBB5E5A30F}.Debug|Any CPU.Build.0 = Debug|Any CPU
{47EF8446-D7D9-4B15-A170-BABBB5E5A30F}.Release|Any CPU.ActiveCfg = Release|Any CPU
{47EF8446-D7D9-4B15-A170-BABBB5E5A30F}.Release|Any CPU.Build.0 = Release|Any CPU
{9758E8DF-CB3E-46CE-B4E2-98B1D51651D6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{9758E8DF-CB3E-46CE-B4E2-98B1D51651D6}.Debug|Any CPU.Build.0 = Debug|Any CPU
{9758E8DF-CB3E-46CE-B4E2-98B1D51651D6}.Release|Any CPU.ActiveCfg = Release|Any CPU
{9758E8DF-CB3E-46CE-B4E2-98B1D51651D6}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {D10BCC6A-C354-4291-9DBF-C9863F7C62C0}
EndGlobalSection
EndGlobal
```

Command line
```
C:\work\test [master ↑1 +3 ~1 -16 ~]> git clean -qdfx
C:\work\test [master ↑1 +3 ~1 -16 ~]> Test-Path .\Rollup\bin
False
C:\work\test [master ↑1 +3 ~1 -16 ~]> msbuild /t:Restore
Microsoft (R) Build Engine version 15.9.20+g88f5fadfbe for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
Build started 12/7/2018 9:38:21 PM.
Project "C:\work\test\Rollup.sln" on node 1 (Restore target(s)).
ValidateSolutionConfiguration:
Building solution configuration "Debug|Any CPU".
Restore:
Restoring packages for C:\work\test\Rollup\Rollup.csproj...
Restoring packages for C:\work\test\UITests\UITests.csproj...
Committing restore...
Committing restore...
Generating MSBuild file C:\work\test\Rollup\obj\Rollup.csproj.nuget.g.props.
Generating MSBuild file C:\work\test\UITests\obj\UITests.csproj.nuget.g.props.
Generating MSBuild file C:\work\test\UITests\obj\UITests.csproj.nuget.g.targets.
Generating MSBuild file C:\work\test\Rollup\obj\Rollup.csproj.nuget.g.targets.
Writing lock file to disk. Path: C:\work\test\UITests\obj\project.assets.json
Writing lock file to disk. Path: C:\work\test\Rollup\obj\project.assets.json
Restore completed in 214.98 ms for C:\work\test\UITests\UITests.csproj.
Restore completed in 212.7 ms for C:\work\test\Rollup\Rollup.csproj.

NuGet Config files used:
C:\Users\mkharitonov\AppData\Roaming\NuGet\NuGet.Config
C:\Program Files (x86)\NuGet\Config\Microsoft.VisualStudio.Offline.config

Feeds used:
https://api.nuget.org/v3/index.json
C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\
Done Building Project "C:\work\test\Rollup.sln" (Restore target(s)).

Build succeeded.
0 Warning(s)
0 Error(s)

Time Elapsed 00:00:00.79
C:\work\test [master ↑1 +3 ~1 -16 ~]> msbuild /bl
Microsoft (R) Build Engine version 15.9.20+g88f5fadfbe for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\\MSBuild\15.0\bin\MSBuild.exe /bl .\Rollup.sln
Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
Build started 12/7/2018 9:38:29 PM.
Project "C:\work\test\Rollup.sln" on node 1 (default targets).
ValidateSolutionConfiguration:
Building solution configuration "Debug|Any CPU".
Project "C:\work\test\Rollup.sln" (1) is building "C:\work\test\UITests\UITests.csproj" (2) on node 1 (default targets).
PrepareForBuild:
Creating directory "bin\Debug\net472\".
Creating directory "obj\Debug\net472\".
GenerateTargetFrameworkMonikerAttribute:
Skipping target "GenerateTargetFrameworkMonikerAttribute" because all output files are up-to-date with respect to the input files.
CoreCompile:
C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\bin\Roslyn\csc.exe /noconfig /unsafe- /checked- /nowarn:1701,1702,1701,1702 /nostdl
ib+ /errorreport:prompt /warn:4 /define:TRACE;DEBUG;NETFRAMEWORK;NET472 /highentropyva+ /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Frame
work\.NETFramework\v4.7.2\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Core.dll" /refe
rence:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Data.dll" /reference:"C:\Program Files (x86)\Reference Assem
blies\Microsoft\Framework\.NETFramework\v4.7.2\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\Sys
tem.Drawing.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.IO.Compression.FileSystem.dll" /refere
nce:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Numerics.dll" /reference:"C:\Program Files (x86)\Reference Ass
emblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Runtime.Serialization.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\
.NETFramework\v4.7.2\System.Xml.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Xml.Linq.dll" /deb
ug+ /debug:portable /filealign:512 /optimize- /out:obj\Debug\net472\UITests.dll /ruleset:"C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Team T
ools\Static Analysis Tools\\Rule Sets\MinimumRecommendedRules.ruleset" /subsystemversion:6.00 /target:library /warnaserror+ /utf8output /deterministic+ Class1.
cs "C:\Users\mkharitonov\AppData\Local\Temp\.NETFramework,Version=v4.7.2.AssemblyAttributes.cs" obj\Debug\net472\UITests.AssemblyInfo.cs /warnaserror+:NU1605
Using shared compilation with compiler from directory: C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\bin\Roslyn
_CopyOutOfDateSourceItemsToOutputDirectory:
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\nunit.engine.dll" to "bin\Debug\net472\nunit.engine.dll".
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\nunit.engine.api.dll" to "bin\Debug\net472\nunit.engine.api.dll".
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\NUnit3.TestAdapter.dll" to "bin\Debug\net472\NUnit3.TestAdapter.dl
l".
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\NUnit3.TestAdapter.pdb" to "bin\Debug\net472\NUnit3.TestAdapter.pd
b".
CopyFilesToOutputDirectory:
Copying file from "obj\Debug\net472\UITests.dll" to "bin\Debug\net472\UITests.dll".
UITests -> C:\work\test\UITests\bin\Debug\net472\UITests.dll
Copying file from "obj\Debug\net472\UITests.pdb" to "bin\Debug\net472\UITests.pdb".
Done Building Project "C:\work\test\UITests\UITests.csproj" (default targets).

Project "C:\work\test\Rollup.sln" (1) is building "C:\work\test\Rollup\Rollup.csproj" (3) on node 1 (default targets).
PrepareForBuild:
Creating directory "bin\Debug\net472\".
Creating directory "obj\Debug\net472\".
GenerateTargetFrameworkMonikerAttribute:
Skipping target "GenerateTargetFrameworkMonikerAttribute" because all output files are up-to-date with respect to the input files.
CoreCompile:
C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\bin\Roslyn\csc.exe /noconfig /unsafe- /checked- /nowarn:1701,1702,1701,1702 /nostdl
ib+ /errorreport:prompt /warn:4 /define:TRACE;DEBUG;NETFRAMEWORK;NET472 /highentropyva+ /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Frame
work\.NETFramework\v4.7.2\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Core.dll" /refe
rence:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Data.dll" /reference:"C:\Program Files (x86)\Reference Assem
blies\Microsoft\Framework\.NETFramework\v4.7.2\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\Sys
tem.Drawing.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.IO.Compression.FileSystem.dll" /refere
nce:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Numerics.dll" /reference:"C:\Program Files (x86)\Reference Ass
emblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Runtime.Serialization.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\
.NETFramework\v4.7.2\System.Xml.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Xml.Linq.dll" /ref
erence:C:\work\test\UITests\bin\Debug\net472\UITests.dll /debug+ /debug:portable /filealign:512 /optimize- /out:obj\Debug\net472\Rollup.dll /ruleset:"C:\Progra
m Files (x86)\Microsoft Visual Studio\2017\Enterprise\Team Tools\Static Analysis Tools\\Rule Sets\MinimumRecommendedRules.ruleset" /subsystemversion:6.00 /targ
et:library /warnaserror+ /utf8output /deterministic+ obj\Debug\net472\Rollup.AssemblyInfo.cs /warnaserror+:NU1605
Using shared compilation with compiler from directory: C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\bin\Roslyn
_CopyFilesMarkedCopyLocal:
Copying file from "C:\work\test\UITests\bin\Debug\net472\UITests.dll" to "bin\Debug\net472\UITests.dll".
Copying file from "C:\work\test\UITests\bin\Debug\net472\UITests.pdb" to "bin\Debug\net472\UITests.pdb".
Creating "C:\work\test\Rollup\obj\Debug\net472\Rollup.csproj.CopyComplete" because "AlwaysCreate" was specified.
_CopyOutOfDateSourceItemsToOutputDirectory:
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\nunit.engine.dll" to "bin\Debug\net472\nunit.engine.dll".
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\NUnit3.TestAdapter.pdb" to "bin\Debug\net472\NUnit3.TestAdapter.pd
b".
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\nunit.engine.api.dll" to "bin\Debug\net472\nunit.engine.api.dll".
Copying file from "C:\Users\mkharitonov\.nuget\packages\nunit3testadapter\3.11.2\build\net35\NUnit3.TestAdapter.dll" to "bin\Debug\net472\NUnit3.TestAdapter.dl
l".
CopyFilesToOutputDirectory:
Copying file from "obj\Debug\net472\Rollup.dll" to "bin\Debug\net472\Rollup.dll".
Rollup -> C:\work\test\Rollup\bin\Debug\net472\Rollup.dll
Copying file from "obj\Debug\net472\Rollup.pdb" to "bin\Debug\net472\Rollup.pdb".
Done Building Project "C:\work\test\Rollup\Rollup.csproj" (default targets).

Done Building Project "C:\work\test\Rollup.sln" (default targets).

Deferred Messages

Detailed Build Summary
======================

============================== Build Hierarchy (IDs represent configurations) =====================================================
Id : Exclusive Time Total Time Path (Targets)
-----------------------------------------------------------------------------------------------------------------------------------
0 : 0.046s 0.851s C:\work\test\Rollup.sln ()
| 1 : 0.580s 0.580s C:\work\test\UITests\UITests.csproj ()
. 2 : 0.209s 0.226s C:\work\test\Rollup\Rollup.csproj ()
| | 3 : 0.009s 0.009s C:\work\test\UITests\UITests.csproj (GetTargetFrameworks)
| . 4 : 0.008s 0.008s C:\work\test\UITests\UITests.csproj (GetNativeManifest)

============================== Node Utilization (IDs represent configurations) ====================================================
Timestamp: 1 Duration Cumulative
-----------------------------------------------------------------------------------------------------------------------------------
636798335100192873: 0 0.034s 0.034s
636798335100533786: 1 0.580s 0.614s ###########
636798335106329212: 2 0.063s 0.677s #
636798335106961300: 3 0.008s 0.685s
636798335107041507: 2 0.040s 0.725s
636798335107442188: 4 0.008s 0.733s
636798335107522409: 2 0.106s 0.839s ##
636798335108585229: 0 0.012s 0.851s
-----------------------------------------------------------------------------------------------------------------------------------
Utilization: 100.0 Average Utilization: 100.0

Build succeeded.
0 Warning(s)
0 Error(s)

Time Elapsed 00:00:00.94
C:\work\test [master ↑1 +3 ~1 -16 | +1 ~0 -0 !]> dir .\Rollup\bin\Debug\net472\NUnit3.TestAdapter.dll

Directory: C:\work\test\Rollup\bin\Debug\net472

Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 11/22/2018 7:56 AM 352768 NUnit3.TestAdapter.dll

C:\work\test [master ↑1 +3 ~1 -16 | +1 ~0 -0 !]>
```

### Expected behavior
The dependency `NUnit3TestAdapter` of UITests does not end up in the bin folder of Rollup, because it has PrivateAssets = All

### Actual behavior
It ends up there as if PrivateAssets does not matter.

### Environment data
```
C:\work\test [master ↑1 +3 ~1 -16 | +1 ~0 -0 !]> msbuild /version
Microsoft (R) Build Engine version 15.9.20+g88f5fadfbe for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

15.9.20.62856
```
I can attach the binlog, if needed.