Bridges: Fix feature interruption/unintended kick caused by external actions

If a manager or CLI user attached a mixmonitor to a call running a dynamic
bridge feature while in a bridge, the feature would be interrupted and the
channel would be forcibly kicked out of the bridge (usually ending the call
during a simple 1 to 1 call). This would also occur during any similar action
that could set the unbridge soft hangup flag, so the fix for this was to
remove unbridge from the soft hangup flags and make it a separate thing all
together.

ASTERISK-24027 #close
Reported by: mjordan
Review: https://reviewboard.asterisk.org/r/3900/
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Merged revisions 420934 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 420940 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@420947 f38db490-d61c-443f-a65b-d21fe96a405b
PJSIP: Prevent crash no-URI contacts

This prevents a crash from occurring when a contact with no URI is used
for the creation of an outbound out-of-dialog request with no
associated endpoint.
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Merged revisions 420949 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 420950 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@420953 f38db490-d61c-443f-a65b-d21fe96a405b
res_pjsip_send_to_voicemail.c: Fix svn file properties.
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Merged revisions 420956 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 420957 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@420958 f38db490-d61c-443f-a65b-d21fe96a405b