Don't crash when destroying chan_dahdi pseudo channels.

Must do a deep copy of the cc_params in duplicate_pseudo().  Otherwise,
when the duplicate pseudo channel is destroyed, it frees the original
pseudo channel cc_params.  The original pseudo channel is then left with a
dangling pointer for when the next duplicated pseudo channel is created.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@262743 65c4cc65-6c06-0410-ace0-fbb531ad65f3