back on cleaning up the usage of flags.

Move together flags used in the same way (e.g. dialog only,
dialog-peer, ...) so it will become easier to deal with them
in a more systematic way.
This is being done in stages so it will be easier to detect
breakage, if any should occur.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@77669 65c4cc65-6c06-0410-ace0-fbb531ad65f3