This desire for a linguistic shift in the terminology has been around for over a decade. See http://www.snopes.com/inboxer/outrage/master.asp .

FWIW, this pull request ( from May 20, 2014 so by HN tradition there should be a (2014) in the headline) is mentioned at https://en.wikipedia.org/wiki/Master/slave_%28technology%29#... , along with Drupal 8.