Generate Security events in chan_sip using new Security Events Framework

Generate Security events in chan_sip using new Security Events Framework

Security Events Framework was added in 1.8 and support was added for AMI to generate
events at that time. This patch adds support for chan_sip to generate security events.

(closes issue ASTERISK-18264)
Reported by: Michael L. Young
Patches:
     security_events_chan_sip_v4.patch (license #5026) by Michael L. Young
Review: https://reviewboard.asterisk.org/r/1362/

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@337595 65c4cc65-6c06-0410-ace0-fbb531ad65f3