fix: out of sync attachments during nova cleanup

Max Lamprechtrequested to merge
attachment-fixes into devel

cinder needs additional policy to allow nova-compute to delete volume attachments. This is needed for periodic nova tasks that do not have customer/user context:

e.g. https://github.com/openstack/nova/blob/1da9c2d6fe391b56c8a7b2a55c0aa38c23b331e1/nova/compute/manager.py#L11667

Signed-off-by: Max Lamprecht max.lamprecht@digits.schwarz

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