Fix hourly log rotation schedule

W/o this patch, new log rotation template for
Fuel 5.x master node with docker (which is
/etc/logrotate.d/20-fuel-docker.conf) would
never be scheduled for execution.
And that could have caused master node's /var/log/
free space exhausted until the next planned daily
log rotation will come.

Closes-bug: #1378327

Change-Id: I21ba3debcfda4d94d5e25786f97996f6431e5ec3
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>