Reconfigure OCG to use bunyan logging instead of winston.

See: I0c8654d36f93385fde2219fb633b64e439dc8cf9
See: If9e1c690831001f79e8119267fdaaad13ab244d5
Change-Id: I7ba409713d5e485fe902b32bf41d996bbac846e6
Merge "Reconfigure OCG to use bunyan logging instead of winston." into production