Fix keystone, cinder, heat-api cron containers

Fix keystone, cinder, heat-api cron containers

The cron containers need to run as root in order to create PID files
correctly.

Additionally, the keystone_cron container was misconfigured to
use /usr/bin/cron instead of the correct /usr/bin/crond.

Additionally we have an issue where the Kolla keystone container has
hard coded ARGS for the docker container which causes -DFOREGROUND
(an Apache specific argument) to get appended onto the kolla_start
command thus causing crond to fail to startup correctly. This
works around the issue by overriding the command and calling
kolla_set_configs manually. Once we fix this in Kolla we can
revisit this.

Change-Id: Ib8fb2bef9a3bb89131265051e9ea304525b58374
Related-bug: 1707785