FreeSWITCH-event-for-gateway-ping

Merge pull request #213 in FS/freeswitch from ~MISHEHU/freeswitch:bugfix/FS-7340-mod_curl-json-api-change to master

* commit '5303101df05a01e82060df253d68d14a44f4260b':
  FS-7340: Converting the json handling to use the types and functions in switch_json.h .