Add CinderBackupWorkers and CinderBackupMaxOperations

New CinderBackupWorkers and CinderBackupMaxOperations support
configuring the concurrency of cinder backup and restore operations.
The default values match cinder's own default values.

Change-Id: I9b6387a00bb5f422a68e7a84a4da2be5907d30c1

deployment/cinder/cinder-backup-container-puppet.yaml

@@ -56,6 +56,15 @@ parameters:
     type: string
     constraints:
     - allowed_values: ['swift', 'ceph', 'nfs', 'gcs', 's3']
+  CinderBackupWorkers:
+    type: number
+    default: 1
+    description: The number of cinder-backup processes to launch.
+  CinderBackupMaxOperations:
+    type: number
+    default: 15
+    description: The maximum number of concurrent cinder backup/restore
+                 operations (0 means unlimited).
   CinderBackupRbdClusterName:
     type: string
     default: ''
@@ -143,6 +152,8 @@ outputs:
       config_settings:
         map_merge:
           - get_attr: [CinderBase, role_data, config_settings]
+          - cinder::backup::backup_workers: {get_param: CinderBackupWorkers}
+            cinder::backup::backup_max_operations: {get_param: CinderBackupMaxOperations}
           - if:
             - {equals: [{get_param: CinderBackupBackend}, 'ceph']}
             - cinder::backup::ceph::backup_ceph_user:

releasenotes/notes/cinder-backup-concurrency-dc7627c617d36133.yaml

@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    Two new parameters are added to control the concurrency of Cinder's
+    backup and restore operations:
+
+    * CinderBackupWorkers
+    * CinderBackupMaxOperations