test: addCleanup after using iscsi storage pools in TestMachines
test: addCleanup after using iscsi storage pools in TestMachines

also add some debug output for the failing test.

deryni/cockpit,martinpitt/cockpit,garrett/cockpit,mvollmer/cockpit,deryni/cockpit,martinpitt/cockpit,garrett/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,garrett/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,mvollmer/cockpit,deryni/cockpit,deryni/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,deryni/cockpit,deryni/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,mvollmer/cockpit