Update k8s version from 1.14 to 1.15 for integ tests (#162)

Author: akartsky

tests/codebuild/run_integtest.sh

@@ -74,7 +74,7 @@ if [ "${need_setup_cluster}" == "true" ]; then
  readonly cluster_region="us-east-1"
 
  # By default eksctl picks random AZ, which time to time leads to capacity issue.
- eksctl create cluster "${cluster_name}" --timeout=40m --region "${cluster_region}" --zones us-east-1a,us-east-1b,us-east-1c --auto-kubeconfig --version=1.14 --fargate
+ eksctl create cluster "${cluster_name}" --timeout=40m --region "${cluster_region}" --zones us-east-1a,us-east-1b,us-east-1c --auto-kubeconfig --version=1.15 --fargate
  eksctl create fargateprofile --namespace "${crd_namespace}" --cluster "${cluster_name}" --name namespace-profile --region "${cluster_region}"
  eksctl create fargateprofile --namespace "${default_operator_namespace}" --cluster "${cluster_name}" --name operator-profile --region "${cluster_region}"