chan_sip: Add TLS and SRTP status to CLI command 'sip show channel'

ASTERISK-23564 #close
Reported by: Patrick Laimbock
Review: https://reviewboard.asterisk.org/r/3474/
........

Merged revisions 413876 from http://svn.asterisk.org/svn/asterisk/branches/11
........

Merged revisions 413877 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@413878 f38db490-d61c-443f-a65b-d21fe96a405b