Where did applyEntityAI() go? You probably need that.
You don't need the @Override in the applyEntityAttributes, and you need to call the super method on that. Look at the EntityZombie class.
EDIT: sorry, I was looking at 1.10 source, this may or may not work for you.
EDIT 2: Yes, my suggestion is still the same, look at the EntityZombie class.