- Runs only when TEST_LIBVIRT_HOST is set, so manage.py test on a
developer machine no longer creates VMs on the local libvirtd.
- Every VM and volume is named wvc-test-*, and volumes live in a
temporary wvc-test pool (/var/lib/libvirt/wvc-test) instead of the
default pool next to real images.
- Cleanup removes only prefixed domains and the test pool's volumes;
it also clears leftovers of an interrupted run before starting, and
tolerates domains that turned transient.
- tearDownClass fails if any domain or volume outside the test
namespace appeared, disappeared or was replaced.
- livetest gains create_volume/define_vm helpers and
test_live_dataloss.py, whose setUpClass opens the class transaction
last, so a failed libvirt connection cannot lock the test database
for later test classes.
The first live tests reproduce two known external-snapshot data losses
and are marked expectedFailure: reverting deletes a disk added after
the snapshot, and deleting the older of two snapshots deletes the
newer one's overlay.
