Get rid of system property for turning off 'strict' transformers rejection testing

WFCORE-1892 reworks the rejection transformers testing, and tightens it up a bit. Most things work fine with this stricter checking, apart from ejb3 which needs reworking. To get around this WFCORE-1892 has a temporary system property to disable this stricter checking. This work lives in my WFCORE-1892-investigation for merging after we have a core release with WFCORE-1892.