Re-enable test_node_delete_failure test
Re-enable test_node_delete_failure test

Update test to use nodepool-buidler for images.

Change-Id: Id0734ffb511acd40c045d4e2737730a62870e14f
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

Tesora/tesora-nodepool,Tesora/tesora-nodepool