When set reclaim_instance_interval > 0, and then delete an
instance which booted from volume with `delete_on_termination`
set as true. After reclaim_instance_interval time pass,
all volumes boot instance will with state: attached and in-use,
but attached instances was deleted.
This bug case as admin context from
`nova.compute.manager._reclaim_queued_deletes` did not have
any token info, then call cinder api would be failed.
So add user/project CONF with admin role at cinder group,
and when determine context is_admin and without token, do
authenticaion with user/project info to call cinder api.