VolumesListTest may hide configuration issues

The VolumesListTest may skip a test if we do not have enough space for
volumes. But it also can lead to false positive test results.

This change keeps the clean up part, but have the test class to raise an
exception.

Change-Id: Ib82fabb1684ee6beaac2a7c45b0b2dc8ec5d6b4c
Merge "VolumesListTest may hide configuration issues"