Be able to use "xwiki.authentication.cookiedomains" with different domain names

Currently the "xwiki.authentication.cookiedomains" variable from xwiki.cfg doesn't work if you use different domain names.

For example if you set:

xwiki.authentication.cookiedomains=domain1.org, domain2.com

and you login on domain1.org, you won't be still logged in on domain2.com.