[ticket/11613] Allow cookies to work on netbios domains

PHPBB3-11613
Merge pull request #3188 from marc1706/ticket/11613

[ticket/11613] Allow cookies for domains without dots

* marc1706/ticket/11613:
  [ticket/11613] Allow cookies to work on netbios domains
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  [ticket/11613] Allow cookies to work on netbios domains