Add RFC 3327 Path header support to chan_sip

This patch adds support for RFC 3327 "Path" headers. This can be enabled in
sip.conf using the 'supportpath' setting, either on a global basis or on a
peer basis. This setting enables Asterisk to route outgoing out-of-dialog
requests via a set of proxies by using a pre-loaded route-set defined by the
Path headers in the REGISTER request. This patch also adds Realtime support
for dynamically updating the Path information for a peer.

A huge thank-you to Klaus Darillion and Olle E Johansson for their efforts
in writing this patch.

Review: https://reviewboard.asterisk.org/r/2235/
Review: https://reviewboard.asterisk.org/r/991/

(closes issue ASTERISK-16884)
Reported by: klaus3000
Tested by: klaus3000, oej, mjordan
patches:
  path-1.8.0-patch.txt uploaded by klaus3000 (License 5054)
  oolong-path-support-trunk in team branch by oej (License 5267)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@382440 65c4cc65-6c06-0410-ace0-fbb531ad65f3

contrib/realtime/postgresql/realtime.sql

@@ -38,6 +38,7 @@ amaflags character varying(7),
 callgroup character varying(10),
 callerid character varying(80),
 canreinvite character varying(3) DEFAULT 'yes',
+supportpath character varying(3) DEFAULT 'no',
 context character varying(80),
 defaultip character varying(15),
 dtmfmode character varying(7),
@@ -70,6 +71,7 @@ cancallforward character varying(3) DEFAULT 'yes',
 lastms integer DEFAULT 0 NOT NULL,
 defaultuser character varying(80),
 fullcontact character varying(80),
+path character varying(256),
 regserver character varying(30),
 useragent character varying(40),
 callbackextension character varying(40)