By Matt Hardy Before the start of the current rugby season both Gloucester and the Sharks, from Durban, would have been full of hope for their domestic campaigns. But soon into their Premiership and United Rugby Championship campaigns, things began to unravel and any hopes of winning a league title disappeared over a cliff. It left the two sides lingering towards the bottom of their respective leagues, looking for an alternative way to keep fans happy and build some momentum. Enter the Challenge Cup. The little sisterThe little sibling to the Investec Champions Cup, the Challenge Cup has been …