Revert improved identities sent in dialog-info NOTIFY requests in r360862

Revert improved identities sent in dialog-info NOTIFY requests in r360862

Revision 360862 was intended to improve identities sent in dialog-info
NOTIFY requests. Some users reported that hint became broken once this
was done. It's not clear exactly what part of the patch has caused this
regression, but broken hints are bad.

For now, this revision is being reverted so that the next releases of
Asterisk do not have bad behavior in them. The original reported issue
will have to be fixed differently in the next version of Asterisk.

(issue ASTERISK-16735)
........

Merged revisions 364706 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@364707 65c4cc65-6c06-0410-ace0-fbb531ad65f3