Update repotasks tests to avoid nuget issues

Author: markcowl

tools/RepoTasks/RepoTasks.Cmdlets.Tests/RepoTasks.Cmdlets.Tests.csproj

@@ -94,15 +94,6 @@
     </ProjectReference>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\src\packages\xunit.core.2.3.1\build\xunit.core.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\src\packages\xunit.core.2.3.1\build\xunit.core.props'))" />
-    <Error Condition="!Exists('..\..\..\src\packages\xunit.core.2.3.1\build\xunit.core.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\src\packages\xunit.core.2.3.1\build\xunit.core.targets'))" />
-    <Error Condition="!Exists('..\..\..\src\packages\xunit.runner.console.2.3.1\build\xunit.runner.console.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\src\packages\xunit.runner.console.2.3.1\build\xunit.runner.console.props'))" />
-    <Error Condition="!Exists('..\..\..\src\packages\xunit.runner.visualstudio.2.3.1\build\net20\xunit.runner.visualstudio.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\src\packages\xunit.runner.visualstudio.2.3.1\build\net20\xunit.runner.visualstudio.props'))" />
-  </Target>
   <Import Project="..\..\..\src\packages\xunit.core.2.3.1\build\xunit.core.targets" Condition="Exists('..\..\..\src\packages\xunit.core.2.3.1\build\xunit.core.targets')" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

tools/RepoTasks/RepoTasks.Cmdlets.Tests/packages.config

@@ -7,6 +7,6 @@
   <package id="xunit.core" version="2.3.1" targetFramework="net452" />
   <package id="xunit.extensibility.core" version="2.3.1" targetFramework="net452" />
   <package id="xunit.extensibility.execution" version="2.3.1" targetFramework="net452" />
-  <package id="xunit.runner.console" version="2.3.1" targetFramework="net452" />
-  <package id="xunit.runner.visualstudio" version="2.3.1" targetFramework="net452" />
+  <package id="xunit.runner.console" version="2.3.1" targetFramework="net452" developmentDependency="true"/>
+  <package id="xunit.runner.visualstudio" version="2.3.1" targetFramework="net452" developmentDependency="true"/>
 </packages>