Test local_dev.test_brick_lvm.BrickLvmTestCase.test_lv_deactivate_timeout
doesn't mock time.sleep which is used for retries.
It increases test execution time to ~2s instead of ~0.02.
Change-Id: Id3704d90de0b3d04401c0b7b7686470685dbc1cc
Closes-Bug: #1620986