Add test events for time limit-related hangups

This patch adds hangup-related test events in order to support testing
of time-limited bridges. This aids in testing the S() and L() bridge
options.

(issue SWP-4713)
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Merged revisions 378119 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 378120 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 378121 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@378122 65c4cc65-6c06-0410-ace0-fbb531ad65f3