[cv] fix imports.
[cv] fix imports.

R=tikuta

Change-Id: Ife007a1bac9ad6643add48f19c2b1053baa4fb98
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3226467
Auto-Submit: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go