Apply Glance database migration

Apply Glance database upgrade procedure:

https://docs.openstack.org/glance/latest/admin/zero-downtime-db-upgrade.html

Change-Id: Ife6974db538df8c1461714203974d47a5c577985
Implements: blueprint apply-service-upgrade-procedure

docker/glance/glance-api/extend_start.sh

@@ -7,3 +7,21 @@ if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
     glance-manage db_load_metadefs
     exit 0
 fi
+
+# Migrate database and exit if KOLLA_UPGRADE variable is set. This catches all cases
+# of the KOLLA_UPGRADE variable being set, including empty.
+if [[ "${!KOLLA_UPGRADE[@]}" ]]; then
+    if [[ "${!GLANCE_DB_EXPAND[@]}" ]]; then
+        echo "Expanding database"
+        glance-manage db expand
+    fi
+    if [[ "${!GLANCE_DB_MIGRATE[@]}" ]]; then
+        echo "Migrating database"
+        glance-manage db migrate
+    fi
+    if [[ "${!GLANCE_DB_CONTRACT[@]}" ]]; then
+        echo "Contracting database"
+        glance-manage db contract
+    fi
+    exit 0
+fi

releasenotes/notes/implement-glance-zero-downtime-upgrade-2825a2c76315d23d.yaml

@@ -0,0 +1,5 @@
+---
+
+features:
+  - |
+    Implement Glance zero-downtime upgrade logic.