add warning for commands to be removed

Author: Yugang Wang

src/ServiceManagement/Services/Commands/CloudService/Development/EnableAzureMemcacheRole.cs

@@ -73,6 +73,8 @@ public EnableAzureMemcacheRoleCommand()
         [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
         public override void ExecuteCmdlet()
         {
+            WriteWarning("This cmdlet will be removed in a future release as part of obselating Managed Cache scaffolding support.");
+
             string rootPath = CommonUtilities.GetServiceRootPath(CurrentPath());
             RoleName = string.IsNullOrEmpty(RoleName) ? CommonUtilities.GetRoleName(rootPath, CurrentPath()) : RoleName;
 

src/ServiceManagement/Services/Commands/CloudService/Development/Scaffolding/AddAzureCacheWorkerRole.cs

@@ -49,6 +49,7 @@ public AddAzureCacheWorkerRoleCommand()
         [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
         public override void ExecuteCmdlet()
         {
+            WriteWarning("This cmdlet will be removed in a future release as part of obselating Managed Cache scaffolding support.");
             AddAzureCacheWorkerRoleProcess(Name, Instances, CommonUtilities.GetServiceRootPath(CurrentPath()));
         }