grant warnings on embedded server.


mysql-test/r/drop.result:
  Move test that has more to do with grants than DROP.
mysql-test/r/grant.result:
  Move test that has more to do with grants than DROP.
mysql-test/t/drop.test:
  Move test that has more to do with grants than DROP.
mysql-test/t/grant.test:
  Move test that has more to do with grants than DROP.