[zendframework/zf2#2962] add missing import
[zendframework/zf2#2962] add missing import

- Added import for SetCookie HTTP header

zendframework/zend-http,weierophinney/zend-http,netroby/zend-http,malinink/zend-http,asgrim/zend-http,Maks3w/zend-http