WASHINGTON — In his first month on the job, White House chief of staff John Kelly has made significant progress toward imposing discipline on a chaotic operation, even as it’s clear he still struggles to have the same effect on the president himself. The White House is a less contentious place and decision-making is becoming more orderly under Kelly’s thumb, according to more than a dozen people interviewed by The Associated Press, including White House officials, outside advisers and others who work regularly with the administration.