Ironic: Add parameter to tune workers

Change-Id: I9d4ace7d1d841ac294fbf09679d184f5af395cb5

deployment/ironic/ironic-api-container-puppet.yaml

@@ -90,6 +90,10 @@ parameters:
     type: string
     constraints:
       - allowed_values: ['oslo', 'json-rpc']
+  IronicWorkers:
+    default: 0
+    description: Number of workers for Ironic services.
+    type: number
 
 conditions:
   cors_allowed_origin_set:
@@ -102,6 +106,8 @@ conditions:
     equals: [{get_param: IronicAuthStrategy}, 'http_basic']
   rpc_transport_json_rpc:
     equals: [{get_param: IronicRpcTransport}, 'json-rpc']
+  ironic_workers_set:
+    not: {equals : [{get_param: IronicWorkers}, 0]}
 
 resources:
   ApacheServiceBase:
@@ -232,6 +238,10 @@ outputs:
                 params:
                   $NETWORK: {get_param: [ServiceNetMap, IronicApiNetwork]}
             ironic::wsgi::apache::ssl: {get_param: EnableInternalTLS}
+            ironic::wsgi::apache::workers:
+              if:
+                - ironic_workers_set
+                - {get_param: IronicWorkers}
             ironic::cors::max_age: 3600
             ironic::cors::allow_methods: 'GET,POST,PUT,DELETE,OPTIONS,PATCH'
             ironic::cors::allow_headers: 'Content-Type,Cache-Control,Content-Language,Expires,Last-Modified,Pragma,X-Auth-Token'

releasenotes/notes/ironic-workers-e752707221a86c36.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The new ``IronicWorkers`` parmaeter has been added. This parameter can be
+    used to tune number of workers for Ironic services.