Network icc

guests shouldn't be able communicate between each other when docker param `--icc=false`
Maybe I am misunderstanding something then.  What is purpose of wrapper in this module over just using ``utils.wait_for`` in test?  Test is already using lambda, and ``wait_for`` is called in other tests, even outside of dockertest.  I think I am not understanding purpose of putting this in central place + having unittests when ``wait_for`` is already central and much more tested already.  What am I missing?