They require a tty or X11 displays, thus are not suitable for headless runs
(such as in mock). Furthermore, they die with the tty or X11 session, which
is somehow late -- a lot of them may accumulate. Let's kill them right away.
Use "TESTS = tests-nm-client test-remote-settings-client" rather than
overriding "check-local".
Add a script "libnm-test-launch.sh" that will handle redirecting the
test via dbus-launch if needed.