Change zfsunlock for better busybox compatibility

It turns out that there are two versions of Busybox, at least on Ubuntu
18.04.  If you have the busybox-static package installed, you get a
busybox that supports `ps a` and `head`.  If you only have
busybox-initramfs, you don't.  Either way, you have `awk`.

This change should also make this compatible with GNU ps, if you somehow
end up with that in the initramfs environment.

Reviewed-by: Tom Caputi <[email protected]>
Reviewed-by: Andrey Prokopenko <[email protected]>
Signed-off-by: Richard Laager <[email protected]>
Closes #10307 

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