Merge branch 'master' into staging

* master: (28 commits)
  go_1_9: skip flaky TestWaitGroupMisuse2
  erlangR18: fix patch hashes with fetchpatch
  xml2: replace dead links
  nixos/pam: fix docs about path to u2f_keys file
  cinelerra: add a note about parallel building
  msmtp: install docs and examples (#31769)
  kernel: Fix out-of-tree modules on aarch64
  nixos/tests/acme: update terms of service to fix test
  gixy: init at 0.1.8
  pythonPackages.ConfigArgParse: 0.9.3 -> 0.12.0, refactor, move to python-modules
  mono: init at 4.8
  wal-g: fix license so not to break evaluation
  wal-g: init at 0.1.2
  maintainers: add backuitist
  nixos/prometheus: Correct documentation for external_labels
  spidermonkey: replace broken links
  vagrant: removed custom rake gem
  vagrant: 2.0.0 -> 2.0.1
  nixos/prometheus: add external_labels option
  nixos/prometheus: add scrape_configs.honor_labels
  ...

pkgs/development/python-modules/configargparse/default.nix

@@ -0,0 +1,21 @@
+{ stdenv, lib, buildPythonPackage, fetchPypi }:
+
+buildPythonPackage rec {
+  pname = "ConfigArgParse";
+  version = "0.12.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0fgkiqh6r3rbkdq3k8c48m85g52k96686rw3a6jg4lcncrkpvk98";
+  };
+
+  # no tests in tarball
+  doCheck = false;
+
+  meta = with lib; {
+    description = "A drop-in replacement for argparse";
+    homepage = https://github.com/zorro3/ConfigArgParse;
+    license = licenses.mit;
+    maintainer = [ maintainers.willibutz ];
+  };
+}