res_pjsip_refer: Fix bugs involving Parking/PJSIP/transfers
PJSIP would never send the final 200 Notify for a blind transfer
when transferring to parking. This patch fixes that. In addition,
it fixes a reference leak when performing blind transfers to
non-bridging extensions.
Review: https://reviewboard.asterisk.org/r/3485/
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Merged revisions 414400 from http://svn.asterisk.org/svn/asterisk/branches/12
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@414403
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