By Denny Dyroff, Entertainment Editor, The Times The Bottle Rockets Music fans who head to the Kennett Flash (102 Sycamore Alley, Kennett Square, 484-732-8295, http://www.kennettflash.org) on June 5 will be in for a double treat – The Bottle Rockets and Sarah Borges. It is a show featuring two acts of headlining status…acts that also interact well with each other. Last year, Borges came to Philadelphia...