Optionsystem, advanced makefile etc

Signed-off-by: Markus Pargmann <mpargmann@allfex.org>
module: example changes

Signed-off-by: Markus Pargmann <mpargmann@allfex.org>
module: sysctl with first plugin drop_caches

Signed-off-by: Markus Pargmann <mpargmann@allfex.org>