res_pjsip_exten_state: Change 'does not exist' warning to notice

The 'new_subscribe: Extension <> does not exist or has no associated hint'
is a config issue and doesn't need to clutter up logs with warnings.
Changed to notice.

Tested-by: George Joseph

Review: https://reviewboard.asterisk.org/r/4307/
........

Merged revisions 430319 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@430321 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_exten_state.c

@@ -334,7 +334,7 @@ static int new_subscribe(struct ast_sip_endpoint *endpoint,
 		const char *resource)
 {
 	if (!ast_exists_extension(NULL, endpoint->context, resource, PRIORITY_HINT, NULL)) {
-		ast_log(LOG_WARNING, "Extension %s does not exist or has no associated hint\n", resource);
+		ast_log(LOG_NOTICE, "Extension %s does not exist or has no associated hint\n", resource);
 		return 404;
 	}