Customize hourly fuel logrotate job for (ana)cron

Anacron would execute @hourly '20-fuel' logrotate job for Centos/Rhel
while cron (by default, anacron option configurable manually) would
do the same task for Ubuntu/Debian

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Separate logrotate config for (ana)cron-hourly, fix (min)size mess

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>