Support "channels" in addition to "channel" in chan_dahdi.conf.

Review: https://reviewboard.asterisk.org/r/804


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@279815 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -16203,7 +16203,7 @@ static int process_dahdi(struct dahdi_chan_conf *confp, const char *cat, struct
 		}
 
 		/* Create the interface list */
-		if (!strcasecmp(v->name, "channel")) {
+		if (!strcasecmp(v->name, "channel") || !strcasecmp(v->name, "channels")) {
  			if (options & PROC_DAHDI_OPT_NOCHAN) {
 				ast_log(LOG_WARNING, "Channel '%s' ignored.\n", v->value);
  				continue;