[Api-ref] fix the type of service_id in worker cleanup api

According to [1], the type of service_id is int, so fix it.

[1]https://review.openstack.org/#/c/569036/

Change-Id: Ie142582a2a73564127be83c1e3531a07311b4153

api-ref/source/v3/parameters.yaml

@@ -2317,7 +2317,7 @@ service_id:
     UUID for the cleanup service.
   in: body
   required: false
-  type: string
+  type: integer
 service_key:
   description: |
     The service name. Deprecated. Keeping service key

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

@@ -2,7 +2,7 @@
     "cluster": "test",
     "disabled": "True",
     "host": "host1@lvmdriver"
-    "service_id": "1",
+    "service_id": 1,
     "is_up": "True",
     "binary": "cinder-volume",
     "resource_id": "b122f668-d15a-40f8-af21-38d218796ab8",

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

@@ -1,7 +1,7 @@
 {
     "cleaning": [
         {
-            "id" "1",
+            "id": 1,
             "host": "host1@lvmdriver",
             "binary": "cinder-volume",
             "cluster_name": "test"