contrib: alpine: update to use env: files for service arguments

- Check for env in /etc/conf.d on Alpine
- Update all services with their respective env: file
- Disable default modules, noew modprobe plugin should handle this
- Add watchdog service
- Rename syslogd -> syslog, in case we want to integrate sysklogd

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

contrib/alpine/finit.d/available/syslogd.conf

@@ -1,2 +0,0 @@
-# Start syslogd as soon as possible, should always run
-service [S12345] syslogd -n -- Syslog daemon