Urls contain ipv6 ipaddresses may not logged correctly

Urls contain ipv6 ipaddresses may not logged correctly

The urls which include an ipv6 address as hostname does not logged correctly
in the following cases:
 - When a user is already logged in to an ftp server and a
   new USER command entered with ipv6 address as hostname the logged url
   does not put ipv6 address inside brackets ([]).
 - On FTP error responses generated by squid the url which includes ipv6
   addresses apearred with brackets urlencoded. eg:
         ftp://%5B::1%5D/