don't complain about not being able to connect to kill node with same name
made cancellableInlineCallbacks's Deferred-like result's cancel method return a Deferred-like to let functions take time to clean up
made action GoalManager.get_result's resulting Deferred have a canceller that cancels the action
made ActionServer.wait_for_server better than a fixed delay
don't print stack trace on unhandled incoming tcpros connection