Update keystone.conf to use new provider config

This change uses the [token] provider configuration rather than
the deprecated [signing] token_format to select between PKI and UUID
tokens.

Closes-Bug: #1273946
Change-Id: Ia03c2375326c14d4783df3c0774599c795b25cf2
Upgrade/Update rubocop

Now that almost all of the rubocop blueprints have been completed, make
one final pass through all of the cookbooks ensuring they're all in
sync with each other.

- Upgrade rubocop to 0.18.1
- Make the rubocop.yml the same as others plus the exception at the bottom

Change-Id: I030322516fcdb1d742d7d4170c1f4436e8115852
Implements: blueprint lint-and-unit-testing-for-havana
Merge "Upgrade/Update rubocop"