The canonical import comment was added some time ago, though several
newly added files do not have the comment. This fix adds the missing
canonical import comment to files in integration tests
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Both names have no real sense, but one allows to make sure these packages
aren't used outside of `integration`.
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
