FreeSWITCH-FS-8767

Merge pull request #468 in FS/freeswitch from ~NCOPA/freeswitch:bugfix/FS-1772-need-a-way-for-individual-end-users to master

* commit '367dabcb55f48a3db1b02c0364e2352993eaa581':
  FS-1772 #resolve fix reset of voicemail greeting to default