clean up HTTP request handling code

	modified:   src/bruce/scripts/bruce_counters.py
	modified:   src/bruce/scripts/bruce_discards.py
	modified:   src/bruce/web_interface.cc
	modified:   src/bruce/web_interface.h
	modified:   src/bruce/web_request_handler.cc
	modified:   src/bruce/web_request_handler.h