issue #2249723 by andrei.dincu: Remove XmlSitemapFormController class
Issue #2249723 by andrei.dincu: Create XmlSitemapDeleteForm class
Issue #2249723 by andrei.dincu: Created lib/Drupal/xmlsitemap/Form/XmlSitemapForm class
Issue #2249723 by andrei.dincu: Changes in XmlSitemapListBuilder, XmlSitemap, xmlsitemap.local_tasks.yml