fix for ZF-5728 - don't reset session if it was provided by setSession
fix for ZF-5728 - don't reset session if it was provided by setSession

git-svn-id: abaeb2b3ba5a94ed391a9405ad7d63d0414021c9@19277 44c647ce-9c0f-0410-b52a-842ac1e357ba

Lansoweb/zend-captcha,MadCat34/zend-captcha