gw6c should start after ifup

[Michael Schnupp]

Binary package hint: gw6c

NetworkManager might need a few seconds to set up an interface.
Since gw6c starts immediately at boot time there is (possibly) no network connection, yet.
Therefore gw6c gives up and exits. - No tunnel, no running gw6c.

gw6c should better start after an interface is brought up.
Actually there is a /etc/network/if-up.d/gw6c, but it only *re*starts gw6c if it is already running.
So, it is not started from the init scrips and not started from if-up, too.

Is there any reason for not starting it simply in /etc/network/if-up.d/gw6c?