Update document for worker cleanup API

Update API document for API 'workers/cleanup',
also remove 'until' from allowed clean keys as
its value is always assigned in code.

Change-Id: Iea940d7c7e52718b8e5e8dcf706aa5d1126860ef

api-ref/source/v3/samples/worker-cleanup-request.json

@@ -2,6 +2,7 @@
     "cluster": "test",
     "disabled": "True",
     "host": "127.0.0.1",
+    "service_id": "1",
     "is_up": "True",
     "binary": "cinder-volume",
     "resource_id": "b122f668-d15a-40f8-af21-38d218796ab8",

api-ref/source/v3/worker-cleanup.inc

@@ -23,7 +23,8 @@ Request
 .. rest_parameters:: parameters.yaml
 
    - project_id: project_id_path
-   - cluster: cluster_mutex
+   - cluster_name: cluster_mutex
+   - service_id: service_id
    - host: host_service
    - binary: binary
    - is-up: is_up

cinder/api/v3/workers.py

@@ -32,8 +32,7 @@ from cinder import utils
 
 class WorkerController(wsgi.Controller):
     allowed_clean_keys = {'service_id', 'cluster_name', 'host', 'binary',
-                          'is_up', 'disabled', 'resource_id', 'resource_type',
-                          'until'}
+                          'is_up', 'disabled', 'resource_id', 'resource_type'}
 
     def __init__(self, *args, **kwargs):
         self.sch_api = sch_rpc.SchedulerAPI()