res_pjsip_session: Add additional checks for delaying session refreshes.
There are certain situations which no checks existed for which need to prevent
session refreshes. This includes sending a session refresh with SDP before SDP
negotiation has completed and sending a session refresh before the dialog itself
has been established. Checks for these have been added.
Additionally COLP related UPDATEs were including SDP when it is not needed.
Review: https://reviewboard.asterisk.org/r/4008/
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Merged revisions 424056 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 424057 from http://svn.asterisk.org/svn/asterisk/branches/13
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@424058
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