Remove extraneous calls to logging.basicConfig.

Addresses #123 

Since all these files all live together in the mongo_orchestration package now, importing the module can cause one of these (now removed) calls to `basicConfig` to be called before the one that sets up the log file (https://github.com/mongodb/mongo-orchestration/blob/master/mongo_orchestration/server.py#L21). If so, no server.log ever gets created.