Revert "Update the XUnit runners to support CoreCLR"

This reverts commit 4ca8634b.

.nuget/packages.config

@@ -10,6 +10,4 @@
   <package id="FakeSign" version="0.9.2" targetFramework="net45" />
   <package id="dnx-coreclr-win-x86" version="1.0.0-beta5-12101" />
   <package id="dnx-mono" version="1.0.0-beta5-12101" />
-  <package id="xunit.runner.console" version="2.1.0-beta3-build3029" />
-  <package id="xunit.runner.msbuild" version="2.1.0-beta3-build3029" />
 </packages>

BuildAndTest.proj

@@ -4,7 +4,7 @@
   ToolsVersion="12.0">
 
   <UsingTask
-    AssemblyFile="packages/xunit.runner.msbuild.2.1.0-beta3-build3029/build/portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.msbuild.dll"
+    AssemblyFile="packages\xunit.runners.2.0.0-alpha-build2576\tools\xunit.runner.msbuild.dll"
     TaskName="Xunit.Runner.MSBuild.xunit" />
 
   <!-- At the moment Jenkins runs on a machine without any build of Visual Studio 2015.  Hence we must
@@ -21,6 +21,7 @@
   </PropertyGroup>
 
   <Target Name="RestorePackages">
+    <Exec Command="&quot;$(MSBuildThisFileDirectory)\.nuget\Nuget.exe&quot; install xunit.runners -pre -version 2.0.0-alpha-build2576 -outputdirectory packages"/>
     <Exec Command="&quot;$(MSBuildThisFileDirectory)\.nuget\Nuget.exe&quot; restore &quot;$(RoslynSolution)&quot;" />
   </Target>
 
@@ -76,7 +77,7 @@
         Binaries\$(Configuration)\Roslyn.Services.Editor.CSharp.UnitTests.dll;" />
     </ItemGroup>
 
-    <Exec Command="Binaries\$(Configuration)\RunTests.exe packages/xunit.runner.console.2.1.0-beta3-build3029/tools/ $(RunTestArgs) @(TestAssemblies, ' ')" />
+    <Exec Command="Binaries\$(Configuration)\RunTests.exe packages\xunit.runners.2.0.0-alpha-build2576\tools $(RunTestArgs) @(TestAssemblies, ' ')" />
 
   </Target>
 

cibuild.sh

@@ -10,7 +10,7 @@ usage()
     echo "  --os <os>           OS to run (Linux / Darwin)"
 }
 
-XUNIT_VERSION=2.1.0-beta3-build3029
+XUNIT_VERSION=2.0.0-alpha-build2576
 BUILD_CONFIGURATION=Debug
 OS_NAME=$(uname -s)
 USE_CACHE=true
@@ -183,7 +183,7 @@ set_mono_path()
 
 test_roslyn()
 {
-    local xunit_runner=packages/xunit.runner.console.$XUNIT_VERSION/tools/xunit.console.x86.exe
+    local xunit_runner=packages/xunit.runners.$XUNIT_VERSION/tools/xunit.console.x86.exe
     local test_binaries=(
         Roslyn.Compilers.CSharp.CommandLine.UnitTests
         Roslyn.Compilers.CSharp.Syntax.UnitTests
@@ -211,6 +211,7 @@ test_roslyn()
 # temporary work around.  
 echo Restoring NuGet packages
 run_nuget restore Roslyn.sln
+run_nuget install xunit.runners -PreRelease -Version $XUNIT_VERSION -OutputDirectory packages
 
 set_mono_path
 which mono