Allow use of python-savannaclient>=0.3

It's used by OpenStack Dashboard plugin for Savanna
https://github.com/stackforge/savanna-dashboard/blob/master/requirements.txt
and for Savanna integration test.

Change-Id: I5039a31adb6f952eec8229ba300276b44277a945
Merge "Allow use of python-savannaclient>=0.3"