Updated openstack/openstack
Project: openstack/requirements  97f83e761a40f5858ad633be766b8de78b6e05dc
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Add XenAPI to OpenStack dependencies

This way, the XenAPI package will be mirrored by the OpenStack pypi
mirror, so it could be installed in the gate.

Change-Id: I185f9ccf26c59a339f94f6918d695f28a5eb5b62