Add routines for parsing SIP URIs consistently.

From the original issue report opened by Nick Lewis:
Many sip headers in many sip methods contain the ABNF structure
 name-andor-addr = name-addr / addr-spec
 Examples include the to-header, from-header, contact-header, replyto-header

 At the moment chan_sip.c makes various different attempts to parse this name-andor-addr structure for each header type and for each sip method with sometimes limited degrees of success.

 I recommend that this name-andor-addr structure be parsed by a dedicated function and that it be used irrespective of the specific method or header that contains the name-andor-addr structure

Nick has also included unit tests for verifying these routines as well, so...heck yeah.

(closes issue #16708)
Reported by: Nick_Lewis
Patches:
      reqresp_parser-nameandoraddr2.patch uploaded by Nick Lewis (license 657

Review: https://reviewboard.asterisk.org/r/549



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@256530 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/sip/include/sip.h

@@ -1647,4 +1647,34 @@ struct sip_monitor_instance {
 	struct sip_epa_entry *suspension_entry;
 };
 
+/*!
+ * \brief uri parameters
+ *
+ */
+
+struct uriparams {
+	char *transport;
+	char *user;
+	char *method;
+	char *ttl;
+	char *maddr;
+	int lr;
+};
+
+struct contact {
+	AST_LIST_ENTRY(contact) list;
+	char *name;
+	char *user;
+	char *pass;
+	char *host;
+	char *port;
+	struct uriparams params;
+	char *headers;
+	char *expires;
+	char *q;
+};
+
+AST_LIST_HEAD_NOLOCK(contactliststruct, contact);
+
+
 #endif