Simplify TransactionManager integration in JMSBridgeService

JMSBridgeService has an odd static method called from start() where it does an MSC ServiceRegistry lookup to find the TransactionManager service. That would be unreliable if the service had no MSC dependency on the TM service. But JMSBridgeAdd creates such a dependency when it installs the bridge service.

This whole thing should be converted into a normal service injection.