Consolidate ast_channel.cid.cid_rdnis into ast_channel.redirecting.from.number.

SWP-1229
ABE-2161

* Ensure chan_local.c:local_call() will not leak cid.cid_dnid when
copying.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@256104 65c4cc65-6c06-0410-ace0-fbb531ad65f3