Zend\Http\Header\SetCookie changed to support empty cookies
Zend\Http\Header\SetCookie changed to support empty cookies

$keyValue is receiving value with '=' when the cookie is empty.

Issue zendframework/zf2#5475
Maks3w/zend-http,malinink/zend-http,netroby/zend-http,zendframework/zend-http,weierophinney/zend-http,asgrim/zend-http