* upstart/message.h: Remove the UPSTART_SHUTDOWN message.
* upstart/message.c (upstart_message_new, upstart_message_handle):
Remove handling for the shutdown message.
* upstart/tests/test_message.c (test_new, test_handle): Remove
tests against the shutdown message.
* init/control.c (control_shutdown): Remove the shutdown command
from the server.
* init/tests/test_control.c (test_shutdown): Remove tests for it.
* init/event.h: Remove the shutdown event.
* util/initctl.c: Remove the shutdown command reference.
* util/events.c (shutdown_action): Remove the command.
* util/events.h: Update.
* util/tests/test_events.c (test_shutdown_action): Remove tests.