To measure the success of the Faster Local Testing project (PM-1360), it will be helpful to measure the execution times of the sections of code that we are aiming to speed up inside ReplSetTest and ShardingTest before we make any improvements. This will help us know how much we improved on performance of various tests. To make this easier, we should add appropriate log messages to allow external tools/scripts to measure the durations of these functions or regions of code easily e.g. ReplSetTest.startSet, ReplSetTest.stopSet, etc.