When binding an object to a form using \Zend\Form\Element\Collection the collection of objects for the fieldsets should not be created new after form validation. During data extraction, all fieldsets in the collection are given their respective object.
Merge branch 'hotfix/3871'

Close #3871
Fixes #3862
Merge pull request #3873 from feibeck/fix_form_collection

Fixes an issue when binding a model to a form collection element
Merge branch 'hotfix/3873' into develop

Forward port #3873