After sparring with legislators for much of the summer, the Lamont administration is sending lawmakers a clear message: Until lawmakers settle on even a short-term plan upgrading Connecticut’s aging infrastructure, other projects will have to wait. Ryan Drajewicz, the governor’s chief of staff, said the governor is standing firm on limiting borrowing for a priority list that includes transportation. But the governor also says Connecticut needs to invest more in its highways, bridges and rail system, and the session ended with him unable to convince lawmakers to tap a major new source of revenue — electronic tolling on the Merritt Parkway and Interstates 84, 91 and 95. The administration says tolls could raise about $800 million annually by 2024 or 2025.