Also skip nix tests on systems without nix.
Change-Id: I4c0069a429df10a496b2651c2506b2d4625d5f43
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1585
Reviewed-by: q3k <q3k@hackerspace.pl>
This allows us to access hscloud nix 'facts' from Go.
Change-Id: Ic8fc3350a7d073947c44529fcae0bbb8627421aa
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1508
Reviewed-by: q3k <q3k@hackerspace.pl>