Have strat engine verify existence of required binaries #986
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Assume that all binaries will be required by stratisd at some time,
and that it shouldn't run if they are not available.
This seems better to me than having a panic if we try to use them and they
are not needed.
Hoist cmd.rs up a level, since it seems like the engine really has to
interact with it.
Postpone dealing with the fact that not all these binaries will actually
be available in the initramfs.
Signed-off-by: mulhern [email protected]