Greenwire: It is a 20-block trip from the Interior Department headquarters to the House Natural Resources Committee’s Capitol Hill hearing rooms, and Secretary Ken Salazar may get to know it well. Committee Republicans, hoping to hold the gavel next session, are planning to bring Salazar and other top department officials to their turf for a host of oversight hearings. In the past two years, Republicans have accused Interior of instituting a de facto moratorium on shallow and deepwater offshore drilling,…