Update keystone config files permissions

The /etc/keystone/*.conf|*.yaml files are world readable.
This may lead to sensitive information leakage and cloud compromise.

Set keystone config files permissions to 0640.
Set keystone config files owner and group to root:keystone.

Change-Id: Id4790a4b2b1362a3eb2457216f24cc06d78371af
Related-Prod: https://mirantis.jira.com/browse/PROD-22095
2 files changed