Setting CookiePolicy to BROWSER_COMPATIBILITY to allow cross domain validation

To support multiple datacenters we want to set cookie domain. Unfortunately cookie standards are really crazy. There are
three different RFCs (RFC 2109 obsoleted by RFC 2965 which is obsoleted by RFC 6265 from 2011 which is not supported yet). 
By switching to BROWSER_COMPATIBILITY we will make sure that cookie domain works as intended and as specified by the newest
RFC 6265.