Kie server: add war assemblies and move integ. tests into own module

@etirelli @mrietveld please review the changes and let me know if there is anything I could fix/enhance.
Thanks for the comments Marco. So if understand correctly the current solution (+0) is best I can think of. Having additional config for Jackson 1.x and _no_ additional config for Jackson 2.x. I believe there is no easy way how to make both Jackson 1.x and Jackson 2.x clients configuration-less as those two versions are basically backwards incompatible.