client: do not wait for the remote to close the connection if it's not ready

This is currently not an issue because the 'time.sleep(1)' in iterateForObject
(storage) and _connectToPrimaryNode (master) leave enough time. What could
happen is a new connection attempt for a node that already has a connection
(causing a failure assertion in Node.setConnection).

neo/client/handlers/master.py

@@ -28,6 +28,7 @@ class PrimaryBootstrapHandler(AnswerBaseHandler):
 
     def notReady(self, conn, message):
         self.app.trying_master_node = None
+        conn.close()
 
     def _acceptIdentification(self, node, uuid, num_partitions,
             num_replicas, your_uuid, primary, known_master_list):

neo/client/handlers/storage.py

@@ -45,6 +45,7 @@ class StorageBootstrapHandler(AnswerBaseHandler):
     """ Handler used when connecting to a storage node """
 
     def notReady(self, conn, message):
+        conn.close()
         raise NodeNotReady(message)
 
     def _acceptIdentification(self, node,