With this year’s Tony Awards set for the coming weekend, Boston celebrated its own vibrant theater community with the 43rd annual Elliot Norton Awards at the Huntington Theatre on Monday. Great art does not belong solely to big cities like London and New York, said Loretta Greco, the Huntington’s artistic director, who stepped onstage midway through the ceremony to accept an award for Outstanding Play (large division) for Jez Butterworth’s “The Hills Of California,” which she directed.