Fix building error

Author: Hao Chen

src/ServiceManagement/HDInsight/Commands.HDInsight.Test/Commands.HDInsight.Test.csproj

@@ -276,7 +276,6 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="app.config" />
     <None Include="MSSharedLibKey.snk" />
     <None Include="packages.config">
       <SubType>Designer</SubType>