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

$keyValue is receiving value with '=' when the cookie is empty.

Issue #5475
Changed to handle whitespaces after '='
Using preg_replace
Changing regex to support empty headerValue
add tests for 5455
Merge pull request #1 from ClemensSahs/hotfix/5455_tests

add tests for 5455
Merge pull request #5476 from leonardomarquine/patch-1

Zend\Http\Header\SetCookie changed to support empty cookies
Merge branch 'hotfix/5476'

Close #5476
Fixes #5475