[gnome-settings-daemon] (19 commits) ...tests: Make sure file time changes seconds

[Benjamin Berg <bberg src gnome org>]

Summary of changes:

  4019d9c... tests: Fail with exit code 77 for more missing dependencies (*)
  f7da08c... tests: Set OutputChecker thread to be a daemon thread (*)
  e4e6f36... tests: Use poll rather than select (*)
  cf9400e... tests: Add timeout to some more calls (*)
  a8e8843... power: Use addCleanup (*)
  65ea74c... tests: Use addClassCleanup in X11 session helper (*)
  e575515... tests: Use addClassCleanup in GsdTestCase (*)
  148b682... tests: Try showing a backtrace when meson terminates the pr (*)
  eabff3d... tests: Close session/system bus dbus connections (*)
  8461c26... tests: Remove unneeded assert from OutputChecker (*)
  6dc24e0... tests: Correctly handle EOF in OutputChecker (*)
  468fab7... tests: Kill processes instead of just terminating them (*)
  e81e1b5... tests: Use OutputChecker for notification daemon (*)
  dc22db2... tests: Do not use PIPE when not required (*)
  cc675ca... xsettings: Use OutputChecker for tests and wait for daemon  (*)
  edd4e2d... tests: Sync GSettings after modifying them (*)
  eba846d... tests: Move more logic into common test code (*)
  28c6f31... tests: Fix close of invalid file descriptor (*)
  54d0749... tests: Make sure file time changes seconds (*)

(*) This commit already existed in another branch; no separate mail sent