EZP-22522: fixed using wrong class
EZP-22522: implemented createFromConnection()
EZP-22522: adapt LegacyDbHandlerFactory
EZP-22522: adapted test
Merge pull request #816 from ezsystems/fix-EZP-22522-postgres-sqlite-dbhandler

Fix EZP-22522: Unable to install eZ Publish 5.3 on Postgres