Default cinder enable_v1_api to true

As of Juno, Cinder will be deprecating the Cinder V1 API and setting it
to not be enabled by default. We'll make it enabled in devstack to
continue tests while it's supported.

Change-Id: Ia09eed0375a73c69a29b1aa379b5bd9fd3a1f5b7
Add missing config option os_auth_url

Without this option will appear as an error:
Skip interval_task because Keystone error:
Authorization Failed: Unable to establish connection to
http://localhost:5000/v2.0/tokens

Closes-Bug: #1325383

Change-Id: I42fe92596d9d475f2c5b2a6aa6b49d2b7b821c54
Merge "Default cinder enable_v1_api to true"
Merge "Add missing config option os_auth_url"