JBTM-2032 revert the compiler version for code coverage back to 1.6
JBTM-2032 revert the compiler version for code coverage back to 1.6

mmusgrov/narayana,jbosstm/narayana,gytis/narayana,jbosstm/narayana,tomjenkinson/narayana,mmusgrov/narayana,gytis/narayana,jbosstm/narayana,gytis/narayana,tomjenkinson/narayana,mmusgrov/narayana,gytis/narayana,gytis/narayana,gytis/narayana,tomjenkinson/narayana,mmusgrov/narayana,tomjenkinson/narayana,jbosstm/narayana