Updated openstack/openstack
Project: openstack/keystone  db0519dfa0d8891de0fe41c935a2e671608d6e95

Make gen_pki.sh & debug_helper.sh bash8 compliant

Now that bash8 is available on PyPI we can use it to clean up the bash
scripts in Keystone. This also uses bash8 in tox. For now we can add
files to the tox check manually as we make them compliant.

Change-Id: I87a7478949114163f0614b1a6d8b249e14afe0df