vagrant: Add vagrant-libvirt to the gemset

With this, you can "install" the plugin just by adding the following to
~/vagrant.d/plugins.json:

  {
    "version":"1",
    "installed": {
      "vagrant-libvirt": {
        "ruby_version":"2.5.3",
        "vagrant_version":"2.2.0",
        "gem_version":"",
        "require":"",
        "sources":[]
      }
    }
  }

pkgs/development/tools/vagrant/gemset_libvirt.nix

@@ -1,19 +1,118 @@
 {
+  excon = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "15l9w0938c19nxmrp09n75qpmm64k12xj69h47yvxzcxcpbgnkb2";
+      type = "gem";
+    };
+    version = "0.62.0";
+  };
+  fog-core = {
+    dependencies = ["builder" "excon" "formatador"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0ac25s2wv7m6av7h7vjzd2bg3srhnn5yrz3lq1xpimhnfmp82sw6";
+      type = "gem";
+    };
+    version = "1.43.0";
+  };
+  fog-json = {
+    dependencies = ["fog-core" "multi_json"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1zj8llzc119zafbmfa4ai3z5s7c4vp9akfs0f9l2piyvcarmlkyx";
+      type = "gem";
+    };
+    version = "1.2.0";
+  };
+  fog-libvirt = {
+    dependencies = ["fog-core" "fog-json" "fog-xml" "json" "ruby-libvirt"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0gk16gsjd51x71wla7h5jqr6x5ywpwz5l8jdv76f9mr6fp1j2bkf";
+      type = "gem";
+    };
+    version = "0.5.0";
+  };
+  fog-xml = {
+    dependencies = ["fog-core" "nokogiri"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "043lwdw2wsi6d55ifk0w3izi5l1d1h0alwyr3fixic7b94kc812n";
+      type = "gem";
+    };
+    version = "0.1.3";
+  };
+  formatador = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1gc26phrwlmlqrmz4bagq1wd5b7g64avpx0ghxr9xdxcvmlii0l0";
+      type = "gem";
+    };
+    version = "0.2.5";
+  };
+  json = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "01v6jjpvh3gnq6sgllpfqahlgxzj50ailwhj9b3cd20hi2dx0vxp";
+      type = "gem";
+    };
+    version = "2.1.0";
+  };
   mini_portile2 = {
+    groups = ["default"];
+    platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0gzfmcywp1da8nzfqsql2zqi648mfnx6qwkig3cv36n9m0yy676y";
+      sha256 = "13d32jjadpjj6d2wdhkfpsmy68zjx90p49bgf8f7nkpz86r1fr11";
       type = "gem";
     };
     version = "2.3.0";
   };
   nokogiri = {
     dependencies = ["mini_portile2"];
-      source = {
-        remotes = ["https://rubygems.org"];
-        sha256 = "0byyxrazkfm29ypcx5q4syrv126nvjnf7z6bqi01sqkv4llsi4qz";
-        type = "gem";
-      };
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0byyxrazkfm29ypcx5q4syrv126nvjnf7z6bqi01sqkv4llsi4qz";
+      type = "gem";
+    };
     version = "1.8.5";
   };
+  ruby-libvirt = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0d754d6pgdqyq52pl9hp0x38q1vn3vf9nz4nm5gqdj5i4fw7pba6";
+      type = "gem";
+    };
+    version = "0.7.1";
+  };
+  vagrant-libvirt = {
+    dependencies = ["fog-core" "fog-libvirt" "nokogiri"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1wm5yvml3sxdzpnlp4q6yhy695syy8byd1g7cxll4pmj1kwlknym";
+      type = "gem";
+    };
+    version = "0.0.45";
+  };
 }