Detach volume on device validation failure

Detach volume on device validation failure

If device validation fails when attaching a volume for some driver
operation (copy_volume_data, copy_image_to_volume, copy_volume_to_image)
we may end up with an attached volume that we don't cleanup.

This patch tries to detach the volume if we fail when validating the
device after we have attached the volume.

This happens for example on multipath when we have properly detected the
paths but they are all in a failed state when we try to read from the
device on validation.

Closes-Bug: #1502138
Change-Id: I73be4206930eba7da064e22d86ff2136191acb0b