To be able to get log trace of the Petals CLI software components, add a support of the configuration of Java Logging adapted to the Petals CLI output:
- all traces are printed as following: <LEVEL>: <message>
- the level SEVERE is printed as 'ERROR' (to be compliant with existing error messages,
- other levels are internationally printed,
- by default, only levels SEVERE and WARNING are printed.
The default configuration will be JAR-embedded, and can be overridden through the property 'java.util.logging.config.file'
A sample configuration is provided into the file '$PETALS_CLI_HOME/conf/petals-cli-logging-sample.properties'.