The OOM killer does not make much sense on a router, because regardless
of which process is killed, most of the time some essential core
functionality is affected.
Set the panic on OOM sysctl, so every OOM leads to a kernel panic and
results in a reboot of the router, which restores a clean state.
Fixes: #131
Signed-off-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Johannes Kimmel <fff@bareminimum.eu>