Add possibility to connect/disconnect to a queue @ runtime

[GrtVHecke]

If you use a queue for sending measurements for example and a microservice delivers these to a database, you want to be able to block getting messages from the que if there is something wrong with the database. Otherwise you will loose measurements. This is just 1 use case. But in the end it would be great to have the possibility to enable/disable the connection to the STOM server or halt the subscription to the STOMP server.