Revert "Exclude constants from autodoc"
Revert "Exclude constants from autodoc"

This reverts commit 485a6b2170fe7d62a7ce9b29ccd874ed0f280d77.

With the release of Sphinx 2.1.1[1] constants are no longer autodoc'd so
we don't have this problem any more.

[1] https://github.com/sphinx-doc/sphinx/issues/6447

Change-Id: I8231f95e13ffad8f57ea6d7ae28216bfa27dc3d3

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