Add new experimental jobs to test dib based nodes

We now have new dib based slave nodes, the next step in moving to dib is
to test that these images are viable for testing. Run experimental jobs
that are otherwise identical to two of our existing gate jobs (one with
neutron the other without) on these new dib based slaves.

Change-Id: If69f18a61529fe886a836c6c284103babbcfc2cb
Merge "Add new experimental jobs to test dib based nodes"