Running `make check` on systems without running dbus failed
in test-remote-settings-client.c:383
make[4]: Entering directory `/tmp/NetworkManager/libnm-glib/tests'
/tmp/NetworkManager/libnm-glib/tests/test-remote-settings-client /tmp/NetworkManager/libnm-glib/tests test-remote-settings-service.py
** (/tmp/NetworkManager/libnm-glib/tests/.libs/lt-test-remote-settings-client:26983): WARNING **: Error connecting to D-Bus: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
make[4]: *** [check-local] Trace/breakpoint trap (core dumped)
Modify the Makefile to start the dbus-daemon, if it is not yet
running.
Signed-off-by: Thomas Haller <thaller@redhat.com>