Don't register the dnsmgr refresh CLI command twice.

(closes issue #10856)
Reported by: jamesgolovich
Patches:
      asterisk-dnsmgrclireg.diff.txt uploaded by jamesgolovich (license 176)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@84162 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/dnsmgr.c

@@ -408,7 +408,6 @@ static int do_reload(int loading)
 			if (ast_pthread_create_background(&refresh_thread, NULL, do_refresh, NULL) < 0) {
 				ast_log(LOG_ERROR, "Unable to start refresh thread.\n");
 			}
-			ast_cli_register(&cli_refresh);
 		}
 		/* make a background refresh happen right away */
 		refresh_sched = ast_sched_add_variable(sched, 100, refresh_list, &master_refresh_info, 1);