Update environment var for keystone bootstrap
Update environment var for keystone bootstrap

Related-Bug: #1855932

Change-Id: I6907729bca667459466834276513e9f0233d10d0
Depends-On: https://review.opendev.org/#/c/698329
Depends-On: https://review.opendev.org/#/c/698480

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates