tutorial.md: fix path to cri-tools
Closes:
@@ -104,7 +104,7 @@ go version go1.8.5 linux/amd64
```
go get github.com/kubernetes-incubator/cri-tools/cmd/crictl
-cd $GOPATH/src/github.com/kubernetes-incubator/cri-tools/cmd/crictl
+cd $GOPATH/src/github.com/kubernetes-incubator/cri-tools
make
make install
```
