[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/inventory/hosts b/olt-sw-upgrade/test/ansible/inventory/hosts
new file mode 100644
index 0000000..ffe62eb
--- /dev/null
+++ b/olt-sw-upgrade/test/ansible/inventory/hosts
@@ -0,0 +1,2 @@
+[device-olt]
+192.168.50.150 ansible_ssh_user=root ansible_ssh_pass=onl ansible_sudo_pass=onl ansible_ssh_common_args='-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'