elk: add elasticsearch6, logstash6, kibana6 and the beats at v6.1.0

This change is backwards compatible since the ELK tools at version 5.x
remain unchanged.

The test suite now both tests ELK-5 and ELK-6.

pkgs/development/tools/misc/kibana/6.x.nix

@@ -0,0 +1,40 @@
+{ stdenv, makeWrapper, fetchurl, elk6Version, nodejs, coreutils, which }:
+
+with stdenv.lib;
+let
+  inherit (builtins) elemAt;
+  info = splitString "-" stdenv.system;
+  arch = elemAt info 0;
+  plat = elemAt info 1;
+  shas = {
+    "x86_64-linux"  = "08lkjj9h4ij25b53bgdz825j2ccymlllijbhv9kw1q1liv2irr34";
+    "x86_64-darwin" = "1iqzj01s9walj5arfdlw0dgbmrv6mjp64mch11rx5aybcafv4z9h";
+  };
+in stdenv.mkDerivation rec {
+  name = "kibana-${version}";
+  version = elk6Version;
+
+  src = fetchurl {
+    url = "https://artifacts.elastic.co/downloads/kibana/${name}-${plat}-${arch}.tar.gz";
+    sha256 = shas."${stdenv.system}" or (throw "Unknown architecture");
+  };
+
+  buildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out/libexec/kibana $out/bin
+    mv * $out/libexec/kibana/
+    rm -r $out/libexec/kibana/node
+    makeWrapper $out/libexec/kibana/bin/kibana $out/bin/kibana \
+      --prefix PATH : "${stdenv.lib.makeBinPath [ nodejs coreutils which ]}"
+    sed -i 's@NODE=.*@NODE=${nodejs}/bin/node@' $out/libexec/kibana/bin/kibana
+  '';
+
+  meta = {
+    description = "Visualize logs and time-stamped data";
+    homepage = http://www.elasticsearch.org/overview/kibana;
+    license = licenses.asl20;
+    maintainers = with maintainers; [ offline rickynils basvandijk ];
+    platforms = with platforms; unix;
+  };
+}