Add reference to M.A.Hosting (#4237)

src/IISIntegration/test/Microsoft.AspNetCore.Server.IISIntegration.Tests/Microsoft.AspNetCore.Server.IISIntegration.Tests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>$(StandardTestTfms)</TargetFrameworks>
@@ -9,6 +9,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="$(MicrosoftAspNetCoreHostingPackageVersion)" />
     <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="$(MicrosoftAspNetCoreTestHostPackageVersion)" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(MicrosoftNETTestSdkPackageVersion)" />
     <PackageReference Include="xunit.runner.visualstudio" Version="$(XunitRunnerVisualStudioPackageVersion)" />