Only open stratum server when p2pool is finished synchronizing 
I've run into a reoccurring issue where if I restart my p2pool node and miners were previously connected, they would connect before the p2pool node was fully synchronized. This causes fake shares to be generated and report as submitted (idk how, it doesn't show up in p2pool observer). These "fake shares" continue to be created even after p2pool reports as synchronized, the only solution is to make sure all miners are off, then turning on p2pool, waiting for everything to synchronize, then starting all the miners. Ideally the stratum server shouldn't even be open until this synchronization was completed.