Reduce `logger.Initialise` when writing unite test

[jamieabc]

Current logger package needs to be initialised before using. This increase some complexity when writing unit test.

Not only every test case need to initialize logger, but also when background task is running while main test problem is terminating and finalize logger, it might cause unexpected problem of logger not initialised.

If logger can be default send to stdout, then it provides two benefits:

• no need to setup logger for ever test
• when ever unit test error, with go test -v shows details message of process, facilitate easier debugging

[hxw]

When fixed must revert this commit:
88330ad

(the commit comments out some logs that case a panic on the existing log system)

[jamieabc]

Expected behavior:

1. If logger.Initialise is not called, log should go to standard out
2. if logger.Initialise is called, log should go to file
3. if logger.Finalise is called, log message goes to standard out