Fix ParkAndAnnounce to pass the CallerID to the announcing channel.

Fix ParkAndAnnounce to pass the CallerID to the announcing channel.

ParkAndAnnounce tried to pass the CallerID to the announcing channel but
the ID was wiped out by the channel masquerade done when parking the call.

* Save the CallerID before parking the channel to pass it to the
announcing channel.

* Fixed a minor memory leak in ParkAndAnnounce.

* Updated some ParkAndAnnounce log messages.
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Merged revisions 348310 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 348311 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@348312 65c4cc65-6c06-0410-ace0-fbb531ad65f3