Remove juno branch handling for glance-keystonemiddleware
Remove juno branch handling for glance-keystonemiddleware

With Juno EOL, we do not need to check for stable/juno anymore.

Remove handling for glance, heat, horizon, ironic, keystone,
keystonemiddleware.

Change-Id: I6bdca6d7eced78aa2d453cfb0d03b6b95fa3a3f7

openstack-infra/project-config,noorul/os-project-config,dongwenjuan/project-config,noorul/os-project-config,Tesora/tesora-project-config,openstack-infra/project-config,dongwenjuan/project-config,Tesora/tesora-project-config