* dbus/com.ubuntu.Upstart.xml: Added 'EndSession' method.
* init/Makefile.am: Updated for quiesce.[ch].
* init/conf.c: conf_destroy(): Cleanup function.
* init/conf.h: Prototype.
* init/control.c: control_end_session(): 'EndSession' implemenation.
* init/control.h: Include.
* init/events.h: Added SESSION_END_EVENT.
* init/job_class.c: job_class_max_kill_timeout(): New function.
* init/job_class.h: Prototype.
* init/job_process.c:
  - Added disable_respawn to disallow respawns.
  - job_process_jobs_running(): New function.
  - job_process_stop_all(): New function.
  - job_process_terminated(): Honours disable_respawn.
* init/job_process.h: Prototypes.
* init/main.c:
  - Typos.
  - term_handler(): Quiesce rather than re-exec on receipt of SIGTERM
    when running as a Session Init.
  - main(): Make quiesce() handle cleanup.
* init/man/init.8: Update for Session Init SIGTERM handling.
* init/man/startup.7: Update for Session Init.
* init/session.c: session_destroy(): New function.
* init/session.h: Prototype.
* init/man/session-end.7: New man page.
* init/quiesce.[ch]: New files.