Implement Keystone zero-downtime upgrade

- Introduce database upgrade into keystone
  extend_start.sh script. [1]

[1] http://docs.openstack.org/developer/keystone/upgrading.html#upgrading-without-downtime

Change-Id: Ic615026df2ce8fa79a3efe969d0dda9797c9e79f
Closes-Bug: #1634016

docker/keystone/keystone/extend_start.sh

@@ -41,6 +41,25 @@ if [[ $(stat -c %a ${KEYSTONE_LOG_DIR}) != "755" ]]; then
     chmod 755 ${KEYSTONE_LOG_DIR}
 fi
 
+# Upgrade and exit if KOLLA_UPGRADE variable is set. This catches all cases
+# of the KOLLA_UPGRADE variable being set, including empty.
+if [[ "${!KOLLA_UPGRADE[@]}" ]]; then
+    # TODO(duonghq): check doctor result here
+    # TODO: find reason why doctor failed in gate
+    # sudo -H -u keystone keystone-manage doctor
+    sudo -H -u keystone keystone-manage db_sync --expand
+    sudo -H -u keystone keystone-manage db_sync --migrate
+    exit 0
+fi
+
+# Contract database and exit if KOLLA_FINISH_UPGRADE variable is set.
+# This catches all cases of the KOLLA_FINISH_UPGRADE variable being set,
+# including empty.
+if [[ "${!KOLLA_FINISH_UPGRADE[@]}" ]]; then
+    sudo -H -u keystone keystone-manage db_sync --contract
+    exit 0
+fi
+
 # Bootstrap and exit if KOLLA_BOOTSTRAP variable is set. This catches all cases
 # of the KOLLA_BOOTSTRAP variable being set, including empty.
 if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then

releasenotes/notes/implement-keystone-zero-downtime-upgrade-2a082ad24b26751d.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Add supporting script for Keystone zero-downtime upgrade.