Filter internal channels out of bridge enter/leave message handling

Some channels exist merely as an implementation detail in Asterisk, such as
ConfBridge's announcer/recorder channels. These channels should never be
exposed to the outside world, or to interfaces that report on Asterisk. We
already filter out such channels in snapshot processing; however, we failed to
filter out bridge related messages that involved these channels.

This patch filters out bridge related messages that are for such channels. This
prevents a spurious WARNING message from being displayed when those channels
move in and out of bridges.
........

Merged revisions 399146 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@399147 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/cdr.c

@@ -2578,6 +2578,10 @@ static void handle_bridge_enter_message(void *data, struct stasis_subscription *
 		return;
 	}
 
+	if (filter_channel_snapshot(channel)) {
+		return;
+	}
+
 	CDR_DEBUG(mod_cfg, "Bridge Enter message for channel %s: %u.%08u\n",
 			channel->name,
 			(unsigned int)stasis_message_timestamp(message)->tv_sec,