Sam Shepard’s play “True West,” which premiered in 1980, is about a combative relationship between two brothers who reunite in the Los Angeles suburbs after being estranged for five years.Austin, the younger of the two, is a well-adjusted college-educated married screenwriter, while Lee, his older brother, is a thug, an alcoholic and a petty thief.The list of actors who have played these roles through the years reads like a …