- Use netifd no_proto_task for notifying that xl2tpd does not have a
   protocol task running.
 - Use procd for xl2tpd service management.
 - Refreshed 2xx patches to

    - Prevent leftover regular type control result file.
    - Allow xl2tpd run as foreground process while logging via syslog.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

 - bumped version
 - removed dependency on `ip` package as routes are setup by netifd
   if iproute2 is actually required, please depend on
   `@(PACKAGE_ip||PACKAGE_ip-full)` instead of `ip`

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

This reverts commit 981f2da457.
OpenWrt wiki knew l2tp from l2tpv3tun, but luci knew l2tp from xl2tpd

Signed-off-by: Steven Barth <steven@midlink.org>

Use sources on github and add myself as maintainer.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>