BRISTOL — With less than 100 feet remaining in the final heat of Bristol’s 33rd annual Great Outhouse Race, it looked like the two-time reigning champions representing Snap’s Restaurant might lose to the rookies from Camp Kookamunga. Then, from somewhere deep in the hot depths of this year’s Fourth of July festivities, cousins Chris and Kevin Berry, 23 and 20, found their legs, turned on the afterburners and jetted straight through the finish line to reclaim their title as the “World Champions” for the third consecutive year.