virttest.utils_test: Delete volumes for disk and logical pool cleanup

As libvirt also support delete volume for logical and disk pool, add
logical and disk pool to clean besides dir and netfs pool, this fix a
problem when destroy logical pool with error:

/usr/bin/virsh pool-destroy virt-logical-pool
stderr:
error: Failed to destroy pool virt-logical-pool
error: internal error: Child process (/usr/sbin/vgchange -aln vg_logical)
unexpected exit status 5:   Cannot deactivate "vol_create_test_vorigin"
locally..

Signed-off-by: Wayne Sun <gsun@redhat.com>