Revert "Update Roslyn Version to support C# 7.1"

This reverts commit 8f299c5b11.

build/dependencies.props

@@ -9,8 +9,8 @@
     <MoqVersion>4.7.1</MoqVersion>
     <NETStandardImplicitPackageVersion>$(BundledNETStandardPackageVersion)</NETStandardImplicitPackageVersion>
     <RuntimeFrameworkVersion Condition="'$(TargetFramework)'=='netcoreapp2.0'">2.0.0-*</RuntimeFrameworkVersion>
-    <RoslynVersion>2.3.0-beta1</RoslynVersion>
-    <RoslynDevVersion>2.3.0-beta3-61731-06</RoslynDevVersion>
+    <RoslynVersion>2.0.0</RoslynVersion>
+    <RoslynDevVersion>2.3.0-beta1-61624-03</RoslynDevVersion>
     <StreamJsonRpcVersion>1.0.2-rc</StreamJsonRpcVersion>
     <TestSdkVersion>15.3.0-*</TestSdkVersion>
     <VsShellVersion>15.0.26201</VsShellVersion>

test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test/Microsoft.AspNetCore.Mvc.Razor.Extensions.Test.csproj

@@ -29,7 +29,7 @@
     <PackageReference Include="xunit" Version="$(XunitVersion)" />
     <PackageReference Include="xunit.runner.visualstudio" Version="$(XunitVersion)" />
 
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="$(RoslynVersion)" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="2.0.0-*" />
 
     <!-- We need this to compile but don't want it referenced by the project.
       It is included dynamically in CodeGeneration tests. -->
@@ -42,7 +42,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <MvcShim Condition="$(TargetFramework) != ''" Include="..\Microsoft.AspNetCore.Razor.Test.MvcShim\bin\$(Configuration)\$(TargetFramework)\Microsoft.AspNetCore.Razor.Test.MvcShim.deps.json" />
+    <MvcShim
+      Condition="$(TargetFramework) != ''" 
+      Include="..\Microsoft.AspNetCore.Razor.Test.MvcShim\bin\$(Configuration)\$(TargetFramework)\Microsoft.AspNetCore.Razor.Test.MvcShim.deps.json" />
   </ItemGroup>
 
   <Target Name="CopyDepsFromShims" AfterTargets="Build">