Create ITs base on jar that generated during package phase

[romani]

https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html#A_Build_Lifecycle_is_Made_Up_of_Phases , "integration-test" is right after "package"

We need to create tests that do validate all jars that we generate during package phase and also "....-all.jar".

Base on discussion at: #2570 (comment) , base on problem #2516 , #1267 , #2504

[MEZk]

@romani @rnveach
We have Travis test launcher for this.
https://github.com/checkstyle/checkstyle/blob/master/.ci/travis/travis.sh#L17

Do we need additional tests? If not, please, close the issue.

[romani]

This issue is to create maven style IT. IT suppose to run after jar is created to recheck compatibility and other features.