(closes issue #10579)

Reported by: ornati
Make sure the called channel during the attended transfer process becomes associated with the calling channel so that the ast_waitfor_* call works properly under epoll.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@81210 65c4cc65-6c06-0410-ace0-fbb531ad65f3