Fix MvcScaffolding NuGet package failing to install.

Fixed Microsoft.VisualStudio.Shell.Package not using the new EnvDTE interface.

src/AddIns/Misc/PackageManagement/Project/Src/VisualStudio/Package.cs

@@ -14,7 +14,7 @@ namespace Microsoft.VisualStudio.Shell
 	{
 		public static object GetGlobalService(Type serviceType)
 		{
-			if (serviceType == typeof(DTE)) {
+			if (serviceType == typeof(global::EnvDTE.DTE)) {
 				return new DTE();
 			} else if (serviceType == typeof(SVsExtensionManager)) {
 				return new SVsExtensionManager();

src/AddIns/Misc/PackageManagement/Test/Src/VisualStudio/PackageTests.cs

@@ -35,7 +35,7 @@ namespace PackageManagement.Tests.VisualStudio
 		[Test]
 		public void GetGlobalService_GetDTE_ReturnsDTE()
 		{
-			object dte = Package.GetGlobalService(typeof(DTE)) as DTE;
+			object dte = Package.GetGlobalService(typeof(global::EnvDTE.DTE)) as DTE;
 			
 			Assert.IsInstanceOf(typeof(DTE), dte);
 		}