res_pjsip: incorrect qualify statistics after disabling for contact

When removing the qualify_frequency from an AoR or a contact the statistics
shown when issuing "pjsip show aors" from the CLI are incorrect. This patch
deletes the contact's status object from sorcery, disassociating it from the
contact, if the qualify_freqency is removed from configuration.

ASTERISK-24462 #close
Reported by: Mark Michelson
Review: https://reviewboard.asterisk.org/r/4116/
........

Merged revisions 426755 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@426757 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip/pjsip_options.c

@@ -85,6 +85,19 @@ static struct ast_sip_contact_status *find_or_create_contact_status(const struct
 	return status;
 }
 
+static void delete_contact_status(const struct ast_sip_contact *contact)
+{
+	struct ast_sip_contact_status *status = ast_sorcery_retrieve_by_id(
+		ast_sip_get_sorcery(), CONTACT_STATUS, ast_sorcery_object_get_id(contact));
+
+	if (!status) {
+		return;
+	}
+
+	ast_sorcery_delete(ast_sip_get_sorcery(), status);
+	ao2_ref(status, -1);
+}
+
 /*!
  * \internal
  * \brief Update an ast_sip_contact_status's elements.
@@ -470,6 +483,8 @@ static void qualify_and_schedule(struct ast_sip_contact *contact)
 		}
 
 		schedule_qualify(contact);
+	} else {
+		delete_contact_status(contact);
 	}
 }