Add openapi serialization script

openapi-save.sh

+#!/bin/bash
+set -e
+
+exit()
+{
+    exit=$?
+    kill -9 $ETCD_PID $HYPERKUBE_PID 2>/dev/null || true
+    rm -f hyperkube
+    return $exit
+}
+
+trap exit EXIT
+
+echo Compiling hyperkube
+./hack/update-codegen.sh || ./hack/update-codegen.sh
+go build -o hyperkube ./cmd/hyperkube
+etcd &
+ETCD_PID=$!
+./hyperkube kube-apiserver --etcd-servers http://localhost:2379 --cert-dir $(pwd)/certs &
+HYPERKUBE_PID=$!
+
+while ! curl -f http://localhost:8080/healthz; do
+    echo waiting for k8s
+    sleep 1
+done
+
+curl http://localhost:8080/openapi/v2 > openapi.json
+curl -H "Accept: application/com.github.proto-openapi.spec.v2@v1.0+protobuf" http://localhost:8080/openapi/v2 > openapi.pb
+
+git add openapi.json
+git add openapi.pb
+git commit -m "Save openapi"