Support and test ansible-odl deployments will all defaults vars

The current design of the ansible-opendaylight test logic is such that there is a builder/script that is meant to apply ODL with all default vars, then run tests. A second builder/script runs serially to override some default param and run tests again.

However, the default buildr/script still uses a playbook that overrides the default rpm_repo_url var. That result in verify jobs always testing that version of ODL, not whatever version the actual defaults point to. This is evident when changing the defaults, like in INTPAK-223.

Should add test coverage that actually uses all default vars.

Update: Discovered while adding test coverage that the rpm_repo_url var we always override is actually broken out of the box. See comments for details. Re-scoped this issue to cover.