Updated openstack/openstack
Project: openstack-dev/devstack  8097838ab1221358da274c1d8d6f1c238e71a037
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Switch the base URL to git.openstack.org

The git repositories on github for openstack are mirrors of the primary
repositories, which are hosted on git.openstack.org, so switch as much
as I can to using the primary, rather than the github mirror.

Change-Id: Idcfda49a691582055256b830c61e098f4a271339