Fixed a 'panic: invalid argument to Intn' runtime error caused by the recently added 'RequestDelay' member of the Config struct not getting initialized. Corrected the problem by initializing the Config struct with defaults first. We then only need to override values explicitly set as parameters by the user. The rest of the struct members maintain their default values.
Fixed a 'panic: invalid argument to Intn' runtime error caused by the recently added 'RequestDelay' member of the Config struct not getting initialized. Corrected the problem by initializing the Config struct with defaults first. We then only need to override values explicitly set as parameters by the user. The rest of the struct members maintain their default values.

ethanvaughn/automated-perf-test,ethanvaughn/automated-perf-test