Update E2E WebApplication templates to fix tests errors in project creation (#7208)

Author: martinrrm

test/EndToEnd/ProjectTemplates/EmptyWebApplicationProject40.zip/WebApplication.csproj

@@ -69,12 +69,12 @@ $endif$
   </ItemGroup>
 
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v17.0\WebApplications\Microsoft.WebApplication.targets" />
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion))\WebApplications\Microsoft.WebApplication.targets" Condition="'$(VSToolsPath)' != ''" />
   <!-- 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.
   <Target Name="BeforeBuild">
   </Target>
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>

test/EndToEnd/ProjectTemplates/WebApplicationProject40.zip/WebApplication.csproj

@@ -127,12 +127,12 @@
     <Content Include="Site.Master" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v17.0\WebApplications\Microsoft.WebApplication.targets" />
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\WebApplications\Microsoft.WebApplication.targets" Condition="'$(VSToolsPath)' != ''" />
   <!-- 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.
   <Target Name="BeforeBuild">
   </Target>
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>