Merge branch 'master' into staging

* master: (71 commits)
  xen: enable parallel building
  spice: 0.13.3 -> 0.14.0
  powerline-rs: 0.1.7 -> 0.1.8 (#41736)
  xidlehook: 0.4.6 -> 0.4.8 (#41094)
  serf: update scons patch, enable kerberos on darwin
  firefox-bin: Add ffmpeg to lib path
  firefox-beta-bin: 61.0b10 -> 61.0b12
  firefox-devedition-bin: 61.0b10 -> 61.0b12
  wireguard-go: assign yegortimoshenko as maintainer
  wireguard-go: 0.0.20180519 -> 0.0.20180531
  zfs: Fix "zfs-sync" for modern systemd
  nixos/memcached: added simple set/get test
  jenkins: 2.89.4 -> 2.107.3 (#41618)
  focuswriter: 1.6.12 -> 1.6.13 (#41567)
  ne: 3.0.1 -> 3.1.1 (#41536)
  libpqxx: 6.2.3 -> 6.2.4 (#41547)
  mate.mate-applets: 1.20.1 -> 1.20.2 (#41546)
  mate.mate-themes: 3.22.16 -> 3.22.17 (#41541)
  nixos/munge: run munge as user munge instead of root. (#41509)
  pstoedit: 3.71 -> 3.73 (#41528)
  ...

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

@@ -2,12 +2,12 @@
 
 buildPythonPackage rec {
   pname = "libvirt";
-  version = "4.1.0";
+  version = "4.4.0";
 
   src = assert version == libvirt.version; fetchgit {
     url = git://libvirt.org/libvirt-python.git;
     rev = "v${version}";
-    sha256 = "0z87y6qr0ypdxfanphxl7yanisd7a0b0bwhg97kii68mig5dlw9r";
+    sha256 = "01kwwwacbq7kbsslb2ac3wwfs4r8nsv7jhn0df2mmff30izbhq34";
   };
 
   nativeBuildInputs = [ pkgconfig ];

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

@@ -2,7 +2,7 @@
 
 buildPythonPackage rec {
   pname = "nbxmpp";
-  version = "0.6.5";
+  version = "0.6.6";
   name = "${pname}-${version}";
 
   # Tests aren't included in PyPI tarball.
@@ -10,7 +10,7 @@ buildPythonPackage rec {
     name = "${name}.tar.bz2";
     url = "https://dev.gajim.org/gajim/python-nbxmpp/repository/archive.tar.bz2?"
         + "ref=${name}";
-    sha256 = "0b7jw07s4mnp20gcg8raw4bhw2h1hxf75cbn4f2ynj69fbpfr38h";
+    sha256 = "10n7z613p00q15dplsvdrz11s9yq26jy2qack6nd8k7fivfhlcmz";
   };
 
   propagatedBuildInputs = [ pyopenssl ];