Catch and report errors from copy image to volume.

The copy image-to-volume errors weren't being handled
properly and the result was the lvcreate being retried
even though the lvcreate itself succeeded.

The result of this was misleading errors stating that
the volume couldn't be created because it already existed
(which it did, becuase the create itself was succesful).

Fixes bug: 1183283

Change-Id: I23f05fe64475c3efe285e05a258c4625b801375c