Add swagger (OpenAPI 2.0) support (#1245)

* Add swagger (OpenAPI 2.0) support
* Gererate swagger_doc before building bundle image

pkg/apis/fission.io/v1/tool/update-generated-swagger-docs.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+# Copyright 2015 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Generates `types_swagger_doc_generated.go` files for API group
+# versions. That file contains functions on API structs that return
+# the comments that should be surfaced for the corresponding API type
+# in our API docs.
+
+
+#
+# Please refer https://github.com/kubernetes/kubernetes/tree/master/hack for original file
+#
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+FISSION_CRD_VERSION=v1
+
+source "swagger.sh"
+
+# To avoid compile errors, remove the currently existing files.
+
+for group_version in "${FISSION_CRD_VERSION}"; do
+  kube::swagger::gen_types_swagger_doc "${group_version}" ../../${FISSION_CRD_VERSION}
+done