When we call `go get -d -v
github.com/kubernetes-incubator/cri-tools/...` which repos has been
moved to `github.com/kubernetes-sigs/cri-tools`, `go get` will create
package `github.com/kubernetes-sigs/cri-tools`.
```
go get -d -v github.com/kubernetes-incubator/cri-tools/...
github.com/kubernetes-incubator/cri-tools (download)
github.com/kubernetes-sigs/cri-tools (download)
```
According to old version of `github.com/kubernetes-incubator/cri-tools`
Makefile, if there is no `github.com/kubernetes-sigs/cri-tools` package,
it will create softlink self to `github.com/kubernetes-sigs/cri-tools`.
But `go get` will create `github.com/kubernetes-sigs/cri-tools` and
there is no softlink. Therefore, the critools are always latest one, not
specific version.
So, use `github.com/kubernetes-sigs/cri-tools` will be better and save
traffic from `go get`.
Signed-off-by: Wei Fu <fuweid89@gmail.com>
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