HELSINKI (Reuters) - Greece's reform package is a major step forward but Eurogroup finance ministers will probably not release a multi-billion euro bailout right away, European Commission Deputy President Jyrki Katainen said on Monday. He told Finnish broadcaster YLE it was likely that further discussions on debt relief would come before the five billion euro package is released. Greek lawmakers earlier passed unpopular pension and tax reforms that the country's leftist-led government hopes will persuade official creditors to unlock bailout cash. ...