fix 1.1 with pinned kubeadm deps (#335)

* fix 1.1 with pinned kubeadm deps

upstream packaging failed:
kubernetes/kubernetes#57334

pinning versions for now to get CI working

* restoring specification for kubelet and cni

Author: chrisplo

cluster/k8s1.6/bootstrap_centos.sh

@@ -18,7 +18,7 @@ EOF
 
 setenforce 0
 
-yum install -y docker kubelet-1.6.5 kubeadm-1.6.5 kubectl-1.6.5 kubernetes-cni-1.6.5 ntp
+yum install -y docker kubelet-1.6.5 kubeadm-1.6.5 kubectl-1.6.5-0 kubernetes-cni-0.5.1 kubernetes-cni-1.6.5 ntp
 
 systemctl enable docker && systemctl start docker
 systemctl enable kubelet && systemctl start kubelet