BC test cleanup

[ivankelly]

See #1028 (comment)

• Move all backwards compat tests under a common directory
• Also move tests into a backward-compat java package.
• close all classloaders in groovy tests
• Add pointers on running arquillian tests
• Add integration tests to CI

[eolivelli]

Currently we have a directory named 'tests', what about renaming it 'ittests' o 'itests' (for ' integration tests')

[ivankelly]

It would be under a common directory under tests, likes tests/backwards-compat