- Strip surrounding ''s from username when a new user connects. There
   is no user 'a@', it should be a@


mysql-test/r/grant2.result:
  Update test result
mysql-test/t/grant2.test:
  Add tests for bug 13310
sql/sql_parse.cc:
  Strip surrounding ''s from username when a new user connects. There 
  is no user 'a@', it should be a@