Updated openstack/openstack
Project: openstack/nova  c54039c507adc9f83bc11e959a8d296e6c0982f4

Remove admin context which is not needed.

_get_guest_config use admin context to read deleted flavor, it's
not needed because flavor function in db layer didn't require that.

Change-Id: Idbf6a7d712d432da5a5919c28e988870ead0d4b2