Update nixops to 1.5.1

(cherry picked from commit 1b57bf274ae5c76e91b2b264d8aa8bfcecb72102)

pkgs/tools/package-management/nixops/default.nix

···
 { callPackage, fetchurl }:
 
 callPackage ./generic.nix (rec {
-  version = "1.5";
+  version = "1.5.1";
   src = fetchurl {
     url = "http://nixos.org/releases/nixops/nixops-${version}/nixops-${version}.tar.bz2";
-    sha256 = "0z4pzc55wjab8v4bkrff94f8qp1g9ydgxxpl2dvy5130bg1s52wd";
+    sha256 = "0pba9c8ya4hvqmg458p74g69hb06lh0f5bsgw7dsi8pjrcb0624g";
   };
 })