Add missing openstack.env vars and export to heat

Heat failed on heat-keystone-setup-domain because it requires openrc
style of env vars. Also, genenv missed Keystone port env vars.

There are several openrc instances that are using the keystone public
port, bug filed: https://bugs.launchpad.net/kolla/+bug/1469209



Change-Id: I03b57c43c38fb3ebded4d6f206161cf02fb4883d
Closes-Bug: #1469003
Co-Authored-by: Jeff Peeler <jpeeler@redhat.com>