Ensure that we run token-flush cron job under correct user.
Ensure that we run token-flush cron job under correct user.

Also remove creation of /var/log/keystone/keystone.log as it should be created correctly now.
Closes-bug: rhbz#1071674

Change-Id: I450d89d47527db101f56bf173062ba33ceb3b54d

stackforge/packstack,xbezdick/packstack,palmer159/openstack-test,xbezdick/packstack,fr34k8/packstack,mahak/packstack,imcsk8/packstack,imcsk8/packstack,openstack/packstack,mahak/packstack,openstack/packstack,openstack/packstack,mahak/packstack,stackforge/packstack,palmer159/openstack-test,imcsk8/packstack,fr34k8/packstack,xbezdick/packstack,fr34k8/packstack,palmer159/openstack-test,stackforge/packstack