Fixed the error when logging in as superuser. bugid:112464
Fixed wrong pageCount. bugid:112464
Fixed wrong check of "site_id" parameter. bugid:112464
Fixed wrong assetCount. bugid:112464
Implemented "list_entries_for_tag", "list_entries_for_site_and_tag", "list_assets_for_tag" and "list_assets_for_site_and_tag" endpoints. bugid:112464