Use pseudo channel (but real channel) instead of just directly opening...

Use pseudo channel (but real channel) instead of just directly opening /dev/zap/pseudo to enable future meetme enhancements (bug #1766)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3125 65c4cc65-6c06-0410-ace0-fbb531ad65f3