Rural/Metro Corp., a Scottsdale-based company that provides fire and ambulance services for hire in 21 states, filed a petition for Chapter 11 bankruptcy reorganization in federal bankruptcy court in Delaware.  Lenders will loan the company $75 million and it will get additional cash of $135 million during its reorganization.  Rural/Metro was acquired by Warburg Pincus for approximately $438 million in 2011.