adding work around to the proxy /var/run warning

weave

@@ -1278,6 +1278,7 @@ host_arg() {
     fi
     if [ "$host" = "/var/run" ]; then
       echo "WARNING: When launching the proxy, unix sockets directly in /var/run can lead to a bug with net namespace cleanup." >&2
+      echo "To work around this, put the unix socket in a subdirectory of /var/run, and symlink it into place." >&2
       echo "For more info, see https://github.com/weaveworks/weave/issues/1455" >&2
     fi
     PROXY_VOLUMES="$PROXY_VOLUMES -v $host:/host$host"