As part of SERVER-21050 we increased the distlock and write concern timeout for config server operations so that they were actually long enough to allow proper retries in the event of config server failure with the default election timeout of 10 seconds. For people on fast reliable networks who turn down their election timeout, however, these values may be too long and lead to slower error detection and retry logic execution. We should calculate these timeouts in term of the election timeout, or at least allow these timeouts to be independently controlled so that people can adjust them down at the same time that they adjust down their election timeout.