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/crond.conf

@@ -1 +1 @@
-service [2345] <pid/syslogd> crond -f -S -c /etc/crontabs -- Cron daemon
+service [2345] <pid/syslogd> env:-/etc/conf.d/crond crond -f -S $CRON_OPTS -- Cron daemon