By David McDonnell Their embrace prior to kick-off was warm, genuine and underlined the mutual respect between them. They may be managerial rivals, going head-to-head for the ultimate prize, but Pep Guardiola and Mikel Arteta greeted each other like long-lost brothers, hugging, back slapping and sharing a few words. Arteta, Guardiola’s assistant at City for three years, then made his way to the opposition bench to greet the coaching staff with whom he shared so much during his time in Manchester. This was as far removed from the enmity between Sir Alex Ferguson and Arsene Wenger as you can get…