Add digit manipulation tag support to chan_dahdi/sig_pri like chan_misdn.

Add the append_msn_to_cid_tag option to chan_dahdi like chan_misdn.

Review:	https://reviewboard.asterisk.org/r/696/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@270219 65c4cc65-6c06-0410-ace0-fbb531ad65f3