- DROP USER command didn't reload the acl_check_hosts cache causing subsequent 
     connect's via TCP to fail randomly.
   - 4.1 version


mysql-test/r/grant2.result:
  Update test results
mysql-test/t/grant2.test:
  Add test for to check that connect via TCP work after "drop user"
sql/sql_acl.cc:
  Reload acl_check_hosts as its memory is mapped to acl_user
  Use acl_user->host.hostname when searching the acl_check_hosts list