Update cfg-module used to create a new component skeleton

[jouvin]

Build tools contains a component cfg-module that can be used to initialize a new configuration module and produce the skeletons for the POM file, the perl module, the pan templates... This is typically done with the command:

mvn archetype:generate -DarchetypeArtifactId=cfg-module -DarchetypeGroupId=org.quattor.maven -DarchetypeVersion=1.51

Unfortunately the result is not compliant with our current best practices and standards... An update is needed!

One cfg-module has been updated, it would be good to add the commande to the developer documentation.