walkmod cfg

[rpau]

I have upgraded walkmod to allow executions without code transformations (just writing files). You need to donwload the 2.1.0 version. To analyze the results, you just need to execute:

walkmod apply

If you want to execute walkmod and you have not changes into the plugins you are using, is faster to execute:

walkmod apply --offline

If it is ok for you, I can proceed to:

1. Create the checkstyle plugin to automatically correct checkstyle problems.
2. Upgrade the pom.xml file to launch walkmod from the build process.

[rmannibucau]

added the file, thks for the PR!