Setup logging.json

The logging.json file is usually located in the specified --config-dir, the same directory as the config.ini file. This path can be explicitly defined using the -l or --logconf options when starting nodeos.

nodeos --help

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Application Command Line Options:
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--config-dir arg                      Directory containing configuration files such as config.ini
-l [ --logconf ] arg (=logging.json)  Logging configuration file name/path for library users