mergeOptions(configFromFile) {
		this.config = _.defaultsDeep(configFromFile, ServiceBroker.defaultOptions);

		this.config = this.overwriteFromEnv(this.config);

		if (this.flags.silent) this.config.logger = false;

		if (this.flags.hot) this.config.hotReload = true;

		// console.log("Merged configuration", this.config);
	}
Merge broker options

Merge options from environment variables and config file. First
load the config file if exists. After it overwrite the vars from
the environment values.

Example options:

	Original broker option: `logLevel`
 Config file property: 	`logLevel`
 Env variable:			`LOGLEVEL`

	Original broker option: `circuitBreaker.enabled`
 Config file property: 	`circuitBreaker.enabled`
 Env variable:			`CIRCUITBREAKER_ENABLED`