Fix pseudo channel allocation errors on startup when using SS7. (from mattf...

Fix pseudo channel allocation errors on startup when using SS7. (from mattf r121914, moving from chan_zap to chan_dahdi)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@122244 65c4cc65-6c06-0410-ace0-fbb531ad65f3