Instead of saving the unit number of the md(4) device name, save the whole name. This does not unnecessarily close the door that in some future we want to test on something other than md(4) devices.
Instead of saving the unit number of the md(4) device name, save the
whole name. This does not unnecessarily close the door that in some
future we want to test on something other than md(4) devices.

Also add a "conf" action so that we can check whether a gctl actually
did the right thing or not. It's one thing to check that the result
strings are as expected, but it doesn't tell us if the end result is
correct. This needs a bit more fleshing out, but for now a visual
(i.e. manual) check suffices.

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