[VOL-3603][SEBA-1000]: Support OLT image upgrade
- patchset on ONL source code (applied when ONL built in inband mode)
- scripts to support image upgrade procedure
- README to test the procedure.
- increased BAL READY TIME before enabling inband channel on BAL.

Change-Id: I069fc1309dd13d504af03552c1709a6b3ba42232
diff --git a/olt-sw-upgrade/test/ansible/upgrade_olt.yml b/olt-sw-upgrade/test/ansible/upgrade_olt.yml
new file mode 100644
index 0000000..80f5dca
--- /dev/null
+++ b/olt-sw-upgrade/test/ansible/upgrade_olt.yml
@@ -0,0 +1,23 @@
+# Copyright (c) 2020 Open Networking Foundation
+#
+# 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.
+
+### BEGIN INIT INFO
+# Description:
+#            This is a ansible-playbook defines the role for a given hosts.
+### END INIT INFO
+---
+   - hosts: device-olt
+     roles:
+       - upgrade
+