Fixed undefined index in ::fromString method. refs#5608
Added unit tests
Allow HTTP SetCookie to consume cookies that expire after 2038 on 32bit systems
reactored setCookie->setExpires 2038 bug on 32bit + added relvant test
Reactored setCookie->setExpires 2038 bug on 32bit and its test
Refactored the setCookie test with expiry over 2038
Merge branch 'hotfix/5773'

Close #5773
Fixes #5772
Merge pull request #5608 from mschindler83/zf5608

Http\Headers undefined index when calling ::fromString(' content-type: text/plain')
Merge branch 'hotfix/5608'

Close #5608
Merge branch 'hotfix/5608' into develop

Forward port #5608
Merge pull request #5677 from mbn18/master

SetCookie With expiry of over 2038 fail on 32bit systems
Merge branch 'hotfix/5677' into develop

Forward port #5677