Update NuGet to version 2.7.1

NuGet.Core version 2.7.40911.225

src/AddIns/Misc/PackageManagement/Project/Src/IPackageRepositoryExtensions.cs

@@ -8,14 +8,14 @@ namespace ICSharpCode.PackageManagement
 {
 	public static class IPackageRepositoryExtensions
 	{
-		public static IDisposable StartInstallOperation(this IPackageRepository repository, string mainPackageId = null)
+		public static IDisposable StartInstallOperation(this IPackageRepository repository, string mainPackageId = null, string mainPackageVersion = null)
 		{
-			return repository.StartOperation(RepositoryOperationNames.Install, mainPackageId);
+			return repository.StartOperation(RepositoryOperationNames.Install, mainPackageId, mainPackageVersion);
 		}
 		
-		public static IDisposable StartUpdateOperation(this IPackageRepository repository, string mainPackageId = null)
+		public static IDisposable StartUpdateOperation(this IPackageRepository repository, string mainPackageId = null, string mainPackageVersion = null)
 		{
-			return repository.StartOperation(RepositoryOperationNames.Update, mainPackageId);
+			return repository.StartOperation(RepositoryOperationNames.Update, mainPackageId, mainPackageVersion);
 		}
 	}
 }

src/AddIns/Misc/PackageManagement/Test/Src/Helpers/FakeOperationAwarePackageRepository.cs

@@ -16,7 +16,7 @@ namespace PackageManagement.Tests.Helpers
 		
 		IDisposable Operation = MockRepository.GenerateStub<IDisposable>();
 		
-		public IDisposable StartOperation(string operationName, string mainPackageId)
+		public IDisposable StartOperation(string operationName, string mainPackageId, string mainPackageVersion)
 		{
 			OperationStarted = operationName;
 			MainPackageIdForOperationStarted = mainPackageId;