FreeSWITCH-FS-6836

Merge pull request #700 in FS/freeswitch from ~RORAMIREZ/freeswitch:feature/mod_callcenter-realtime-counter-answer-abandoned to master

* commit '1661fc6a519dac70bafbe0b0767f5302337a9fb3':
  FS-8822 - [mod_callcenter] Realtime counter for  calls in a queue