Glance added support to configure unified quotas using keystone limits. To enable unified quotas 'use_keystone_limits' config parameter needs to be set. The parameter needs to be added in puppet-glance, puppet-tripleo & THT. Also we need to provide/set/register some default values to quotas if we are enabling it. Reference: https://docs.openstack.org/glance/latest/admin/quotas.html