MXS-1929: Remove listener from service and workers

When a listener is removed from a service, it should also be removed from
any workers it has been added to. This guarantees that if the opening of
the listener was successful, no requests will be accepted on it after the
removal of the listener.

server/core/internal/service.h

@@ -87,6 +87,18 @@ SERV_LISTENER* serviceCreateListener(SERVICE *service, const char *name,
                                      unsigned short port, const char *authenticator,
                                      const char *options, SSL_LISTENER *ssl);
 
+/**
+ * @brief Remove a listener from use
+ *
+ * @note This does not free the memory
+ *
+ * @param service Service that owns the listener
+ * @param char    Name of the listener to remove
+ *
+ * @return True if listener was found and removed
+ */
+bool service_remove_listener(SERVICE *service, const char* target);
+
 void serviceRemoveBackend(SERVICE *service, const SERVER *server);
 
 /**