xci: osa: switch back from GitHub to OpenStack OSA repos

xci: osa: switch back from GitHub to OpenStack OSA repos

Switching to github.com for the gitclones did not make much of a
difference since we are still seeing randomg SSL failures during git
clones. So we can switch back to git://git.openstack.org hoping that
the git protocol will be more efficient than https. Moreover some
projects are moving away from github mirroring and this breaks our
tests.

Change-Id: I8188ec7cbfbf16eeb4634bd9a44b12a104ce1059
Signed-off-by: Markos Chandras <mchandras@suse.de>