Add Savanna d-g jobs to tempest exp pipeline

We need this jobs to start contributing our tests into the tempest. Due
to the small amount of patches comparing with other patches the best
place is the experimental pipeline.

Change-Id: I2b1aaf27a2c78fcb4bbda972fb3d9d9897c40483
Merge "Add Savanna d-g jobs to tempest exp pipeline"