Build via `sam build` Fails When "Amazon.Lambda.Tools" Is Installed in Built Docker Container

### Description

When using a Docker image which has the dotnet tool "Amazon.Lambda.Tools" already installed, the command `sam build` will fail when trying to update the tool. It's something about hardlinks which I'm not knowledgeable enough about Docker to speculate on.

### Steps to reproduce

As documented in [the example repository][] I created.

[the example repository]: https://github.com/chrisoverzero/sam-build-example

### Observed result

Behind the fold.

```
2019-08-20 20:28:18 Using SAM Template at /var/task/template.yml
2019-08-20 20:28:18 Changing event name from creating-client-class.iot-data to creating
-client-class.iot-data-plane
2019-08-20 20:28:18 Changing event name from before-call.apigateway to before-call.api-
gateway
2019-08-20 20:28:18 Changing event name from request-created.machinelearning.Predict to
request-created.machine-learning.Predict
2019-08-20 20:28:18 Changing event name from before-parameter-build.autoscaling.CreateL
aunchConfiguration to before-parameter-build.auto-scaling.CreateLaunchConfiguration
2019-08-20 20:28:18 Changing event name from before-parameter-build.route53 to before-p
arameter-build.route-53
2019-08-20 20:28:18 Changing event name from request-created.cloudsearchdomain.Search t
o request-created.cloudsearch-domain.Search
2019-08-20 20:28:18 Changing event name from docs.*.autoscaling.CreateLaunchConfigurati
on.complete-section to docs.*.auto-scaling.CreateLaunchConfiguration.complete-section
2019-08-20 20:28:18 Changing event name from before-parameter-build.cloudsearchdomain.S
earch to before-parameter-build.cloudsearch-domain.Search
2019-08-20 20:28:18 Changing event name from docs.*.cloudsearchdomain.Search.complete-s
ection to docs.*.cloudsearch-domain.Search.complete-section
2019-08-20 20:28:18 Changing event name from before-parameter-build.logs.CreateExportTa
sk to before-parameter-build.cloudwatch-logs.CreateExportTask
2019-08-20 20:28:18 Changing event name from docs.*.logs.CreateExportTask.complete-sect
ion to docs.*.cloudwatch-logs.CreateExportTask.complete-section
2019-08-20 20:28:18 Changing event name from creating-client-class.iot-data to creating
-client-class.iot-data-plane
2019-08-20 20:28:18 Changing event name from before-call.apigateway to before-call.api-
gateway
2019-08-20 20:28:18 Changing event name from request-created.machinelearning.Predict to
request-created.machine-learning.Predict
2019-08-20 20:28:18 Changing event name from before-parameter-build.autoscaling.CreateL
aunchConfiguration to before-parameter-build.auto-scaling.CreateLaunchConfiguration
2019-08-20 20:28:18 Changing event name from before-parameter-build.route53 to before-p
arameter-build.route-53
2019-08-20 20:28:18 Changing event name from request-created.cloudsearchdomain.Search t
o request-created.cloudsearch-domain.Search
2019-08-20 20:28:18 Changing event name from docs.*.autoscaling.CreateLaunchConfigurati
on.complete-section to docs.*.auto-scaling.CreateLaunchConfiguration.complete-section
2019-08-20 20:28:18 Changing event name from before-parameter-build.cloudsearchdomain.S
earch to before-parameter-build.cloudsearch-domain.Search
2019-08-20 20:28:18 Changing event name from docs.*.cloudsearchdomain.Search.complete-s
ection to docs.*.cloudsearch-domain.Search.complete-section
2019-08-20 20:28:18 Changing event name from before-parameter-build.logs.CreateExportTa
sk to before-parameter-build.cloudwatch-logs.CreateExportTask
2019-08-20 20:28:18 Changing event name from docs.*.logs.CreateExportTask.complete-sect
ion to docs.*.cloudwatch-logs.CreateExportTask.complete-section
2019-08-20 20:28:18 'build' command is called
2019-08-20 20:28:18 No Parameters detected in the template
2019-08-20 20:28:18 1 resources found in the template
2019-08-20 20:28:18 Found Serverless function with name='Example' and CodeUri='./src/Ex
ample'
2019-08-20 20:28:18 Building resource 'Example'
2019-08-20 20:28:18 Loading workflow module 'aws_lambda_builders.workflows'
2019-08-20 20:28:18 Registering workflow 'PythonPipBuilder' with capability 'Capability
(language='python', dependency_manager='pip', application_framework=None)'
2019-08-20 20:28:18 Registering workflow 'NodejsNpmBuilder' with capability 'Capability
(language='nodejs', dependency_manager='npm', application_framework=None)'
2019-08-20 20:28:18 Registering workflow 'RubyBundlerBuilder' with capability 'Capabili
ty(language='ruby', dependency_manager='bundler', application_framework=None)'
2019-08-20 20:28:18 Registering workflow 'GoDepBuilder' with capability 'Capability(lan
guage='go', dependency_manager='dep', application_framework=None)'
2019-08-20 20:28:18 Registering workflow 'GoModulesBuilder' with capability 'Capability
(language='go', dependency_manager='modules', application_framework=None)'
2019-08-20 20:28:18 Registering workflow 'JavaGradleWorkflow' with capability 'Capabili
ty(language='java', dependency_manager='gradle', application_framework=None)'
2019-08-20 20:28:18 Registering workflow 'JavaMavenWorkflow' with capability 'Capabilit
y(language='java', dependency_manager='maven', application_framework=None)'
2019-08-20 20:28:18 Registering workflow 'DotnetCliPackageBuilder' with capability 'Cap
ability(language='dotnet', dependency_manager='cli-package', application_framework=None
)'
2019-08-20 20:28:18 Found workflow 'DotnetCliPackageBuilder' to support capabilities 'C
apability(language='dotnet', dependency_manager='cli-package', application_framework=No
ne)'
2019-08-20 20:28:18 Running workflow 'DotnetCliPackageBuilder'
2019-08-20 20:28:18 Running DotnetCliPackageBuilder:GlobalToolInstall
2019-08-20 20:28:18 Installing Amazon.Lambda.Tools Global Tool
2019-08-20 20:28:18 executing dotnet: ['dotnet', 'tool', 'install', '-g', 'Amazon.Lambd
a.Tools']
2019-08-20 20:28:18
2019-08-20 20:28:18 Error installing probably due to already installed. Attempt to upda
te to latest version.
2019-08-20 20:28:18 executing dotnet: ['dotnet', 'tool', 'update', '-g', 'Amazon.Lambda
.Tools']
2019-08-20 20:28:19
2019-08-20 20:28:19 DotnetCliPackageBuilder:GlobalToolInstall failed
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/aws_lambda_builders/workflow.py", line 2
48, in run
action.execute()
File "/usr/local/lib/python2.7/site-packages/aws_lambda_builders/workflows/dotnet_cli
package/actions.py", line 42, in execute
raise ActionFailedError("Error configuring the Amazon.Lambda.Tools .NET Core Global
Tool: " + str(ex))
ActionFailedError: Error configuring the Amazon.Lambda.Tools .NET Core Global Tool: Dot
net CLI Failed: Tool 'amazon.lambda.tools' failed to update due to the following:
Failed to uninstall tool package 'amazon.lambda.tools': Invalid cross-device link

Build Failed
Error: DotnetCliPackageBuilder:GlobalToolInstall - Error configuring the Amazon.Lambda.
Tools .NET Core Global Tool: Dotnet CLI Failed: Tool 'amazon.lambda.tools' failed to up
date due to the following:
Failed to uninstall tool package 'amazon.lambda.tools': Invalid cross-device link
```

### Expected result

A successful build. Whether that's via a successful update of the tool or via not trying to update the tool (or some other thing?), I have no opinion.

### Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS: In the example case, Amazon Linux.
2. `sam --version`: `SAM CLI, version 0.19.0`

`Add --debug flag to command you are running`