EZP-21889: implement ContentTypeIdentifier criterion visitor for Solr storage
Merge pull request #813 from ezsystems/impl-EZP-21889-contenttype-identifier-solr

Implement EZP-21889: ContentTypeIdentifier Criterion visitor for Solr storage
EZP-22522: fixed using wrong class
EZP-22522: implemented createFromConnection()
EZP-22522: adapt LegacyDbHandlerFactory
EZP-22522: adapted test