Unconditionally enable the FWaaS plugin

It just works, is not needing any additional deps,
and makes tempest pass rate higher.
Fix nova admin id detection

With the fix of admin_auth_url to be unversioned, this regressed
as the url no longer works. We need to use the public auth url
here anyway, so switch to that.
Merge pull request #107 from dirkmueller/fix_admin_edit

Fix nova admin id detection
Merge pull request #106 from dirkmueller/neutron_fwaas

Neutron fwaas