No special parsing needed for DNS arguments

weave

@@ -1242,8 +1242,6 @@ launch() {
     IPRANGE_SPECIFIED=
 
     [ -n "$DOCKER_BRIDGE_IP" ] || DOCKER_BRIDGE_IP=$(util_op bridge-ip $DOCKER_BRIDGE)
-    DNS_ROUTER_OPTS="--dns-listen-address $DOCKER_BRIDGE_IP:53"
-    NO_DNS_OPT=
 
     while [ $# -gt 0 ] ; do
         case "$1" in
@@ -1275,10 +1273,6 @@ launch() {
                 IPRANGE="${1#*=}"
                 IPRANGE_SPECIFIED=1
                 ;;
-            --no-dns)
-                DNS_ROUTER_OPTS=
-                NO_DNS_OPT="--no-dns"
-                ;;
             --no-restart)
                 RESTART_POLICY=
                 ;;
@@ -1374,7 +1368,7 @@ launch() {
         $(router_bridge_opts) \
         --ipalloc-range "$IPRANGE" \
         --dns-effective-listen-address $DOCKER_BRIDGE_IP \
-        $DNS_ROUTER_OPTS $NO_DNS_OPT \
+        --dns-listen-address $DOCKER_BRIDGE_IP:53 \
         $PLUGIN_ARGS \
         --http-addr $HTTP_ADDR \
         --status-addr $STATUS_ADDR \