res_pjsip: Config option to enable PJSIP logger at load time.

Added a "debug" configuration option for res_pjsip that when set to "yes"
enables SIP messages to be logged.  It is specified under the "system" type.
Also added an alembic script to add the option to realtime.

(closes issue ASTERISK-23038)
Reported by: Rusty Newton
Review: https://reviewboard.asterisk.org/r/3148/
........

Merged revisions 407036 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@407037 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/pjsip.conf.sample

@@ -645,7 +645,6 @@
                         ; A value of 0 indicates no maximum (default: "0")
 ;type=  ; Must be of type system (default: "")
 
-
 ;==========================GLOBAL SECTION OPTIONS=========================
 ;[global]
 ;  SYNOPSIS: Options that apply globally to all SIP communications
@@ -664,8 +663,8 @@
                                                         ; endpoint (default: "d
                                                         ; efault_outbound_endpo
                                                         ; int")
-
-
+;debug=no ; Enable/Disable SIP debug logging.  Valid options include yes|no
+          ; or a host address (default: "no")
 
 
 ; MODULE PROVIDING BELOW SECTION(S): res_pjsip_acl