OTP can be configured using three json files `otp-config.json`, `build-config.json`, and `router-config.json`. This function creates a named list for each config file and populates the defaults values.
See also
Other setup:
otp_build_graph(),
otp_check_java(),
otp_check_version(),
otp_dl_demo(),
otp_dl_jar(),
otp_setup(),
otp_stop(),
otp_validate_config(),
otp_write_config()
