Use volume_id rather than volume_name in volume extensions timeout

We're seeing "Volume None failed to reach in-use status within the
required time" because the volume_name is not set as displayName in the
response body, this is different between cinder v1 and v2, so just use
the volume_id in the TimeoutException message, like what the
volumes_client does in it's wait_for_volume_status method.

Related-Bug: #1398078

Change-Id: I24062b559f977d552789d850ea13e365b33070cd
Merge "Use volume_id rather than volume_name in volume extensions timeout"