Handle systems like default FC4 where 127.0.0.1 doesn't always map to 'localhost' first. 
(Bug #11822)


sql/hostname.cc:
  Short-circuit ip_to_hostname() lookup for INADDR_LOOPBACK to allways return 'localhost'.
sql/sql_parse.cc:
  Push special handling of 127.0.0.1 into ip_to_hostname().