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/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@413876 f38db490-d61c-443f-a65b-d21fe96a405b