compute: Use wait_for_volume_attachment_remove when detaching multiattach volumes

This change replaces the attach_volume cleanup call to
wait_for_volume_resource_status with wait_for_volume_attachment_remove
for multiattach volumes. This newer waiter method being able to handle
cases where multiattached volumes remain attached and thus marked as
'in-use' after being detached from another instance.

Closes-Bug: #1858841
Change-Id: I4e9d253cad1b797940c2c1f922b66602ba592416
1 file changed