Install crictl from binary instead of from source

[afbjorklund]

Since we already install docker and cni from binary

[k8s-ci-robot]

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[afbjorklund]

Tested OK with Kubernetes v1.10.0 and KVM2.

$ ./out/minikube start --iso-url=file://$PWD/out/minikube.iso \
                       --network-plugin=cni --container-runtime=cri-o