Updated openstack/openstack
Project: openstack-infra/devstack-gate  87bd569640b32c54ca38fb89e2e5987d4ade371c
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Add Savanna testing support

Introducing DEVSTACK_GATE_SAVANNA=0 by default.

Change-Id: I8fa01e4b0e55344ff5f383184397f904bfaafb73