Add DBGetComplete event after a DBGetResponse.

(closes issue #16965)
 Reported by: rrb3942
 Patches: 
       DBGetComplete.patch uploaded by rrb3942 (license 1003)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@269938 65c4cc65-6c06-0410-ace0-fbb531ad65f3