return existing queue in case already started
return existing queue in case already started

linearregression/vmq_server,erlio/vernemq,dergraf/vmq_server,larshesel/vmq_server,erlio/vmq_server,erlio/vernemq,dergraf/vmq_server,erlio/vernemq,sunnyjain1/vmq_server,larshesel/vmq_server,erlio/vmq_server,erlio/vernemq