Add authoring centos 6.9 bootstrap iso to CI

Add authoring centos 6.9 bootstrap iso to CI pipeline for
integration tests.

.drone.yml

@@ -92,6 +92,24 @@ pipeline:
     when:
       status: success
 
+  custom-bootstrap-iso:
+    image: 'gcr.io/eminent-nation-87317/vic-build-image:yum'
+    pull: true
+    environment:
+      BIN: bin
+      GOPATH: /go
+      SHELL: /bin/bash
+    secrets:
+    - drone_server
+    - drone_token
+    - github_automation_api_key
+    - codecov_token
+    commands:
+    - export BUILD_NUMBER=${DRONE_BUILD_NUMBER}
+    - ./tests/generate-custom-iso.sh centos-6.9
+    when:
+      status: success
+
   vic-integration-test-on-pr:
     image: 'wdc-harbor-ci.eng.vmware.com/default-project/vic-integration-test:1.48'
     pull: true

tests/generate-custom-iso.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Copyright 2017 VMware, Inc. All Rights Reserved.
+#
+# 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.
+#
+# This script is to author custom bootstrap iso image. Pass repo name
+# under isos/base/repos as argument.
+set -e && [ -n "$DEBUG" ] && set -x
+REPO=$1
+mv bin bin.bak
+REPO=${REPO} make bootstrap-custom
+mv bin/bootstrap-${REPO}.iso bin.bak/
+rm -rf bin
+mv bin.bak bin