Debugger:[Remote] Breakpoint can't get hit while lanuch

## Environment data
Client :
OS: win10 x64
VS: vsucorediag (26308.0)

Server: Mac
VS Code version: 1.10.2
C# Extension version: 1.0.1
VSDBG: [https://aka.ms/getvsdbgsh](https://aka.ms/getvsdbgsh)

## Steps to reproduce
1. Open Program.cs in VS2017.
[Program.zip](https://github.com/OmniSharp/omnisharp-vscode/files/832841/Program.zip)
2. Set a breakpoint at line of 13 in Program.cs.
3. Configuration lanuch.xml file as following.


4. Run command:
Debug.MIDebugLaunch /Executable:dotnet /OptionsFile:C:\Users\v-wqian\Desktop\web.xml

## Expected behavior
It should hit the breakpoint.

## Actual behavior
It can not hit breakpoint and stop debugging.