While the prospect of a Jose Mourinho – Ole Gunnar Solskjaer rivalry admitted had our collective mouths a-watering, the big announcement coming out of Turkey on Wednesday at least gave those of a Rangers persuasion something to look forward to. It was not Solskjaer in the end. But instead Giovanni van Bronckhorst. Back in business. Back in business at Besiktas. His appointment confirmed by the Super Lig giants on an initial two year deal – with an option for a third – the Dutchman is returning to management two years after he was fired by Rangers on the back of a Champions League group-stage c…