Fix some issues with skinny callid.

Add extra string to transmit_callinfo_var, Only set string2 to tonum for outgoing calls
and changes to send_callinfo and push_callinfo to not set callid name to last number.

(closes issue ASTERISK-21063)
Reported by: wedhorn
Tested by: snuffy, myself
Patches: 
    skinny-callinfoupdate03.diff uploaded by wedhorn (license 5019)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@381195 65c4cc65-6c06-0410-ace0-fbb531ad65f3