Merged revisions 106945 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r106945 | kpfleming | 2008-03-08 09:59:42 -0600 (Sat, 08 Mar 2008) | 2 lines

don't generate D-Channel "up" and "down" messages unless the channel state is actually changing; also, generate the "up" message when an implicit "up" occurs due to reception of a normal event when we thought the channel was "down"

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@106946 65c4cc65-6c06-0410-ace0-fbb531ad65f3