Add upgrade definition

Change-Id: Icef5e29b160f2c41c61fadb6fca8a218d1e64eac

docker/sahara-upgrade/Dockerfile.j2

@@ -0,0 +1,5 @@
+FROM {{ image_spec("sahara-base") }}
+MAINTAINER {{ maintainer }}
+
+RUN apt-get install -y --no-install-recommends mysql-client \
+    && apt-get clean

service/files/backup.sh.j2

@@ -0,0 +1,6 @@
+#!/bin/bash -ex
+set -o pipefail
+BACKUP_FILE="/var/ccp/backup/sahara/backup-$(date "+%Y%m%d%H%M%S").sql"
+mysqldump {% if db.tls.enabled %} --ssl-mode REQUIRED {% endif %} -h {{ address("database") }} \
+    -u {{ sahara.db.username }} -p{{ sahara.db.password }} \
+    --single-transaction {{ sahara.db.name }} > "${BACKUP_FILE}"

service/upgrade/default.yaml

@@ -0,0 +1,39 @@
+upgrade:
+  name: upgrade-sahara
+  image: sahara-upgrade
+  steps:
+    - name: backup
+      command: /opt/ccp/bin/backup.sh
+      files:
+        - backup-sh
+      volumes:
+        - name: backup-dir
+          path: /var/ccp/backup/sahara
+          type: host
+          readOnly: false
+      topology_key: backup
+    - name: kill-services
+      type: kill-services
+      services:
+        - sahara-api
+        - sahara-engine
+    - name: db-sync
+      command: sahara-db-manage --config-file /etc/sahara/sahara.conf upgrade head
+      files:
+        - sahara-conf
+    - name: roll-api
+      type: rolling-upgrade
+      services:
+        - sahara-api
+    - name: roll-engine
+      type: rolling-upgrade
+      services:
+        - sahara-engine
+files:
+  sahara-conf:
+    path: /etc/sahara/sahara.conf
+    content: sahara.conf.j2
+  backup-sh:
+    path: /opt/ccp/bin/backup.sh
+    content: backup.sh.j2
+    perm: "500"