BOSTON — Ron Roenicke waited five years after his previous managerial job for another opportunity. When it finally came, it wasn’t much of an opportunity at all. The Red Sox told Roenicke before the final game of the season on Sunday that he will not be back in 2021, ending his tenure as a one-year, shotgun stopgap for a pandemic-shortened season with a last-place finish in the AL East. Hurriedly hired on the eve of spring training after Alex Cora was caught cheating during his time in Houston, Roenicke took over a roster that would soon shed 2018 AL MVP Mookie Betts and 2012 AL Cy Young winner David Price, who were traded to the Los Angeles Dodgers.