More generalized isEqual

moregeneralisequal.java

final IsEqual<Boolean> passwordCheckIsEqual = new IsEqual<Boolean>() {
    @Override
    public boolean apply(final Boolean control, final Boolean experiment) {
        final List<String> mismatches = new ArrayList<>();
        final IsEqualUtil.MismatchConsumer consumer = IsEqualUtil.consumeToList(
            mismatches);
        final boolean success = checkNullity(control, experiment, consumer)
            && startCompare(consumer)
            .dotEquals(control, experiment, "checkmatches")
            .get();
        if (success) {
          return true;
        }
        /// send mismatch data to Kafka
        return false;
    }
};