Add logging transport for stdout

[iromli]

In docker environment, it's easier to check logs via stdout. This is an example on how we patch logger.js to use console instead of rotated file: https://github.com/GluuFederation/docker-oxPassport/blob/0129ae05059e71f87063c936418f9aff903a4f35/logger.js#L38.

One of the reasons why we prefer stdout is because we want to utilize external tools such as fluentd, logstash, filebeat, etc, to retrieve logs and transport them to another backend.

We would like to see built-in support for stdout transport for our usecase.

[jgomer2001]

@iromli I added a property to passport-config.json so log output is redirected to console only. Use "consoleLogOnly" : true