This revert to re-enable using tripleo_keystone depends on the patch to
tripleo_keystone and tripleo_container_standalone that fixes the
concatenation of volumes when internal tls is enabled.
This reverts commit aa1ad7a5df.
Related-Bug: #1973863
Depends-On: I84c8c15e9e5adbc3798edf0e4ca7717527d0de47
Change-Id: I57dc45ba87a09a65cca4c735c7900bfe554be67d