When imapgreetings was set to yes, the message was being deleted but wasn't
actually being expunged. When imapgreetings was set to no, the file based
message was not being deleted at all. All good now!

(closes issue #14949)
Reported by: noahisaac
Patches:
      vm_tempgreeting_removal.patch uploaded by noahisaac (license 748), 
      modified by me


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@220833 65c4cc65-6c06-0410-ace0-fbb531ad65f3