* init/job.h (Job): Rename goal_event to cause, also shuffle things
around so that the state is mostly together.
* init/job.c, init/process.c, init/notify.c, init/cfgfile.c: Update
references (and comments) to match the new name.
* init/tests/test_job.c, init/tests/test_event.c,
init/tests/test_process.c, init/tests/test_cfgfile.c,
init/tests/test_notify.c: Likewise.