Remove deprecation of domain_config_upload
Remove deprecation of domain_config_upload

This was the outcome of a discussion on the mailing list:

  http://lists.openstack.org/pipermail/openstack-dev/2017-June/119090.html

Change-Id: I835e4a722855756035725fa7d4524c1fe641ffcf

mahak/keystone,mahak/keystone,openstack/keystone,mahak/keystone,openstack/keystone,openstack/keystone