Fix references for unit tests

Author: shana

src/UnitTests/UnitTests.csproj

@@ -73,7 +73,7 @@
     </Reference>
     <Reference Include="Microsoft.VisualStudio.ComponentModelHost, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <HintPath>..\..\packages\VSSDK.ComponentModelHost.12.0.4\lib\net45\Microsoft.VisualStudio.ComponentModelHost.dll</HintPath>
-      <Private>False</Private>
+      <Private>True</Private>
     </Reference>
     <Reference Include="Microsoft.VisualStudio.CoreUtility, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <HintPath>..\..\packages\Microsoft.VisualStudio.CoreUtility.14.3.25407\lib\net45\Microsoft.VisualStudio.CoreUtility.dll</HintPath>