Repurpose KeystoneWorkers add keystone::wsgi::apache::threads

Now that keystone is run with wsgi apache the KeystoneWorkers
param has no efffect [1]. This repurposes KeystoneWorkers to now
set wsgi::apache::workers and adds the
keystone::wsgi::apache::threads hardcoding to 1 (can overrride
via extraconfig data)

[1] 51c68fb127/manifests/init.pp (L396)

Closes-Bug: 1598092
Change-Id: I503d1f0d3f4c56abfaf4609ea8290e78668013b6

puppet/services/keystone.yaml

@@ -45,10 +45,6 @@ parameters:
     type: string
     default: 'regionOne'
     description: Keystone region for endpoint
-  KeystoneWorkers:
-    default: 0
-    description: Number of workers for Keystone service.
-    type: number
   EndpointMap:
     default: {}
     description: Mapping of service endpoint -> protocol. Typically set
@@ -88,7 +84,10 @@ parameters:
     default: 5672
     description: Set rabbit subscriber port, change this if using SSL
     type: number
-
+  KeystoneWorkers:
+    type: string
+    description: Set the number of workers for keystone::wsgi::apache
+    default: '$::processorcount'
 outputs:
   role_data:
     description: Role data for the Keystone role.
@@ -124,8 +123,6 @@ outputs:
         keystone::endpoint::internal_url: {get_param: [EndpointMap, KeystoneInternal, uri_no_suffix]}
         keystone::endpoint::admin_url: {get_param: [EndpointMap, KeystoneAdmin, uri_no_suffix]}
         keystone::endpoint::region: {get_param: KeystoneRegion}
-        keystone::admin_workers: {get_param: KeystoneWorkers}
-        keystone::public_workers: {get_param: KeystoneWorkers}
         keystone_enable_db_purge: {get_param: KeystoneEnableDBPurge}
         keystone::public_endpoint: {get_param: [EndpointMap, KeystonePublic, uri_no_suffix]}
         keystone::db::mysql::user: keystone
@@ -135,5 +132,8 @@ outputs:
           - '%'
           - "%{hiera('mysql_bind_host')}"
 
+        keystone::wsgi::apache::workers: {get_param: KeystoneWorkers}
+        # override via extraconfig:
+        keystone::wsgi::apache::threads: 1
       step_config: |
         include ::tripleo::profile::base::keystone