nixos/confinement: Allow to configure /bin/sh

Another thing requested by @edolstra in [1]:

  We should not provide a different /bin/sh in the chroot, that's just
  asking for confusion and random shell script breakage. It should be
  the same shell (i.e. bash) as in a regular environment.

While I personally would even go as far to even have a very restricted
shell that is not even a shell and basically *only* allows "/bin/sh -c"
with only *very* minimal parsing of shell syntax, I do agree that people
expect /bin/sh to be bash (or the one configured by environment.binsh)
on NixOS.

So this should make both others and me happy in that I could just use
confinement.binSh = "${pkgs.dash}/bin/dash" for the services I confine.

[1]: https://github.com/NixOS/nixpkgs/pull/57519#issuecomment-472855704

Signed-off-by: aszlig <aszlig@nix.build>

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