behave randomly with mysql_change_user.

The test case had to be moved into not_embedded_server.test file,
because SHOW GLOBAL STATUS does not work properly in embedded
server (see bug 34517).


BitKeeper/deleted/.del-change_user-master.opt:
  Delete: mysql-test/t/change_user-master.opt
mysql-test/r/change_user.result:
  Move test case for Bug#31222 to not_embedded_server.test.
mysql-test/r/not_embedded_server.result:
  Move test case for Bug#31222 to not_embedded_server.test.
mysql-test/t/change_user.test:
  Move test case for Bug#31222 to not_embedded_server.test.
mysql-test/t/not_embedded_server.test:
  Move test case for Bug#31222 to not_embedded_server.test.