Adds variable length callinfo packets to skinny.

Add packet 0x014A (variable length call info messages) to skinny for newer 
firmware. Plenty of unknown information but includes the equivalent functionality 
as the fixed size callinfo packet already included.
Only send this packet if protocol reported is >= 17.

Review: https://reviewboard.asterisk.org/r/2290/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@380755 f38db490-d61c-443f-a65b-d21fe96a405b