Prevent automatic upgrade of kubernetes on 'minikube start'

Author: paliarush

init_project.sh

@@ -92,6 +92,7 @@ cd "${devbox_dir}"
 if [[ ! $(isMinikubeRunning) -eq 1 ]]; then
     status "Starting minikube"
     minikube start --kubernetes-version=v1.15.6 -v=0 --cpus=2 --memory=4096
+    minikube config set kubernetes-version v1.15.6
     minikube addons enable ingress
     minikube addons enable heapster
     # TODO: Remove if not needed