res_pjsip/AMI: add contact.updated event

With the old SIP module AMI sends PeerStatus event on every
successfully REGISTER requests, ie, on start registration,
update registration and stop registration.

With PJSIP AMI sends ContactStatus only when status is changed.
Regarding registration:
on start registration - Created
on stop registration - Removed
but on update registration nothing

This patch added contact.updated event.

ASTERISK-25904

Change-Id: I8fad8aae9305481469c38d2146e1ba3a56d3108f

CHANGES

@@ -277,6 +277,8 @@ Queue
 
 res_pjsip
 ------------------
+ * Added new status Updated to AMI event ContactStatus on update registration
+
  * Added "reg_server" to contacts.
    If the Asterisk system name is set in asterisk.conf, it will be stored
    into the "reg_server" field in the ps_contacts table to facilitate

include/asterisk/res_pjsip.h

@@ -263,6 +263,7 @@ enum ast_sip_contact_status_type {
 	UNKNOWN,
 	CREATED,
 	REMOVED,
+	UPDATED,
 };
 
 /*!

res/res_pjsip/pjsip_options.c

@@ -42,6 +42,7 @@ static const char *status_map [] = {
 	[UNKNOWN] = "Unknown",
 	[CREATED] = "Created",
 	[REMOVED] = "Removed",
+	[UPDATED] = "Updated",
 };
 
 static const char *short_status_map [] = {
@@ -50,6 +51,7 @@ static const char *short_status_map [] = {
 	[UNKNOWN] = "Unknown",
 	[CREATED] = "Created",
 	[REMOVED] = "Removed",
+	[UPDATED] = "Updated",
 };
 
 const char *ast_sip_get_contact_status_label(const enum ast_sip_contact_status_type status)
@@ -530,6 +532,16 @@ static void contact_created(const void *obj)
 	qualify_and_schedule((struct ast_sip_contact *) obj);
 }
 
+/*!
+ * \internal
+ * \brief A contact has been updated.
+ */
+static void contact_updated(const void *obj)
+{
+	update_contact_status((struct ast_sip_contact *) obj, UPDATED);
+	qualify_and_schedule((struct ast_sip_contact *) obj);
+}
+
 /*!
  * \internal
  * \brief A contact has been deleted remove status tracking.
@@ -556,7 +568,8 @@ static void contact_deleted(const void *obj)
 
 static const struct ast_sorcery_observer contact_observer = {
 	.created = contact_created,
-	.deleted = contact_deleted
+	.deleted = contact_deleted,
+	.updated = contact_updated
 };
 
 static pj_bool_t options_start(void)