LPS-32914 Upgrade from 6.0.6 to 6.2.0 fails at JournalConverterUtil

Hi Eduardo,

I'm forwarding the changes @marcellustavares made for fixing LPS-32914.

I've tested them and rebased on current trunk:

* com.liferay.portal.upgrade.v6_2_0.UpgradeJournal finishes successfully without any errors
* JournalConverterUtilTest runs without reporting failures.

Cheers,
Laszlo