Patch from Jon Trowbridge <trow@ximian.com>:

 	* bus/main.c (setup_reload_pipe): Added.  Creates a pipe and sets
 	up a watch that triggers a config reload when one end of the pipe
 	becomes readable.
 	(signal_handler): Instead of doing the config reload in our SIGHUP
 	handler, just write to the reload pipe and let the associated
 	watch handle the reload when control returns to the main loop.

 	* bus/driver.c (bus_driver_handle_reload_config): Added.
 	Implements a ReloadConfig method for requesting a configuration
 	file reload via the bus driver.

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