Set AWS CNI version to 1.5.2 (#291)

(cherry picked from commit 900321b)

Author: deliahu

manager/install_eks.sh

@@ -28,4 +28,7 @@ eksctl create cluster --name=$CORTEX_CLUSTER \
                       --version=1.13 \
                       --asg-access
 
+# https://docs.aws.amazon.com/eks/latest/userguide/cni-upgrades.html
+kubectl apply -f https://raw.githubusercontent.com/aws/amazon-vpc-cni-k8s/v1.5.2/config/v1.5/aws-k8s-cni.yaml >/dev/null
+
 echo -e "\n✓ Spun up the cluster"