* dbus/com.ubuntu.Upstart.xml: Initially empty description for
manager object interface(s).
* dbus/com.ubuntu.Upstart.Job.xml: Initially empty description
for job class object interface(s).
* dbus/com.ubuntu.Upstart.Instance.xml: Initially empty
description for job instance object interface(s).
* dbus/Makefile.am: Distribute the three interface files,
they're used as sources elsewhere.
* configure.ac (AC_CONFIG_FILES): Generate dbus/Makefile
* Makefile.am (SUBDIRS): Descend into the dbus sub-directory.