Don't create world-readable swapfiles

(cherry picked from commit d4986b5fd3ee75d489828d8d7048d8eb60f14c21)
Remove some dead code

(cherry picked from commit 25af3671f9f33c066acd40702268b0fdb900b238)
dhcpcd: Fix segfaults

This fixes several problems in the dhcpcd service:

* A segfault during startup, due to a race with udev (dhcpcd would get
  an ADD event from udev, causing it to re-add an interface that it
  already had, leading to a segfault later on).

* A hang/segfault processing "dhcpcd rebind" (which NixOS calls after
  waking up from suspend).

Also, add "lo" to the list of ignored interfaces. It usually ignores
"lo", but apparently not when it gets an ADD event from udev.

(cherry picked from commit 2d8c0d24f206a3eb32cd86653fa6e70f8018929c)
Make the misc test a bit more robust

(cherry picked from commit 2b7e746c02861f7e10eee9a0d4e00d8dcb537a86)
kde: “kdnssd” package is now called “zeroconf-ioslave”

Close #2358.

(cherry picked from commit a2fad897235fcad6e90c7d0b03a228786c46c9f9)
node.js - use bundled v8                                 :14.04-bugfix:

node needs v8 3.14, which is no longer maintained.
They bundle an in-tree version which does receive backports.

(cherry picked from commit 925c75c68d72a51c858e59351e7b2b59affe9e5e)
neoload: upgrade to 4.1.4 and fix mem issues

(cherry picked from commit d2edc329e10fef1566b7b5cfb95e6b3b1fd1e49f)