Cleanup udptl on exit.

* Cleanup CLI commands on exit.

(issue ASTERISK-20649)
Reported by: Corey Farrell
Patches:
      udptl-shutdown-1_8-10.patch (license #5909) patch uploaded by Corey Farrell
      udptl-shutdown-11-trunk.patch (license #5909) patch uploaded by Corey Farrell
      Modified
........

Merged revisions 377847 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@377848 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/udptl.c

@@ -1421,8 +1421,20 @@ int ast_udptl_reload(void)
 	return 0;
 }
 
+/*!
+ * \internal
+ * \brief Clean up resources on Asterisk shutdown
+ */
+static void udptl_shutdown(void)
+{
+	ast_cli_unregister_multiple(cli_udptl, ARRAY_LEN(cli_udptl));
+}
+
 void ast_udptl_init(void)
 {
-	ast_cli_register_multiple(cli_udptl, ARRAY_LEN(cli_udptl));
 	__ast_udptl_reload(0);
+
+	ast_cli_register_multiple(cli_udptl, ARRAY_LEN(cli_udptl));
+
+	ast_register_atexit(udptl_shutdown);
 }