Make FollowMe optionally update connected line information when the accepting endpoint is bridged.

Like Dial and Queue, FollowMe needs to deal with
AST_CONTROL_CONNECTED_LINE information so when the parties are initially
bridged, the connected line information will be correct.

* Added the 'I' option just like the app_dial and app_queue 'I' option.

* Made 'N' option ignored if the call is already answered.

(closes issue ASTERISK-18969)
Reported by: rmudgett
Tested by: rmudgett

Review: https://reviewboard.asterisk.org/r/1656/
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Merged revisions 350364 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 350415 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@350416 65c4cc65-6c06-0410-ace0-fbb531ad65f3