Fixed cannot delete router port because of permission denied.

Removed the condition check in allowed function that is defined in the RemoveInterface class
which makes no sense because it is set in the delete function that runs after allowed function.

Change-Id: If0274b9dfcb9582a8e99735eb4e2f3e09b06f977
Closes-Bug: #1234447
Merge "Fixed cannot delete router port because of permission denied."