Celtic loanee Johnny Kenny was the hero for Shamrock Rovers last night following his brace against Vikingur Rejkyavik in the Champions League first qualifying round. The Republic of Ireland Under-21 international opened the scoring on eight minutes with a brilliantly timed run to latch on to a Dylan Watts through ball before cutting inside and slamming home inside the area. Only 12 minutes later, Kenny doubled the hosts’ advantage, taking in from Watts again, carrying possession into the opposition penalty area and beating the goalkeeper at the near post. Jack Byrne was sent off on 74 minutes;…