[packaging] Move dbus-launch into the main dbus package

People get confused with the dbus-x11 package for its name containing
"x11" again and again - this moves dbus-launch into the main dbus
package and obsoletes the dbus-x11 subpackage.

Signed-off-by: Martin Kampas <martin.kampas@tieto.com>
Merge pull request #8 from martyone/master

[packaging] Move dbus-launch into the main dbus package