* upstart/job.c, upstart/job.h, upstart/tests/test_job.c: Rename to
enum.c, enum.h and tests/test_enum.c; since this just includes enums
and convert functions really.
* upstart/Makefile.am: Update.
* upstart/libupstart.h: Update include.
* upstart/tests/test_message.c: Update include.