Add d-g jobs for python-savannaclient

We already have a bunch of CLI tests merged into the tempest, so, we'd
like to add python-savannaclient to small savanna 'pipe'. Additionally,
we're going to write some scenarios tests, so, it'll add some tests for
client too.

Change-Id: I38887088077137ba071622f3e1d6d9b353cbebd4
Merge "Add d-g jobs for python-savannaclient"