allow 'rename view' for ALTER ...UPGRADE DATA DIRECTORY NAME command.
it's safe because a view has valid internal db&table names in this case.


mysql-test/r/upgrade.result:
  test result
mysql-test/t/upgrade.test:
  test case
sql/sql_rename.cc:
  allow 'rename view' for ALTER ...UPGRADE DATA DIRECTORY NAME command.
  it's safe because a view has valid internal db&table names in this case.