Yarmouth residents flooded the streets to watch a solemn procession carry the body of slain officer Sean Gannon to his wake at Saint Pius X Church where he’ll remain closely guarded by fellow officers until his funeral tomorrow afternoon.The seaside town — clad in blue at the police department’s request — lined the route which had been decorated with flags, ribbons, and signs expressing Yarmouth’s support for its cops and Gannon’s family.