HORNETQ-1157
HORNETQ-1157 Fix baranowb's patch, sorting out JMSServerManager.start() control.
Renamed "started" field to "start_called" to make its purpose clearer.
Merge pull request #942 from FranciscoBorges/HORNETQ-1157

Hornetq 1157 sort out JMSServerManagerImpl start flags