Add support to configure token caching

Add a new parameter named KeystoneEnableTokenCaching to enable
caching for keystone token to improve performance related to
token management.

Depends-on: https://review.opendev.org/#/c/683010
Change-Id: Id8b33837eebbe18417d4c349e73817aa8f660091

deployment/keystone/keystone-container-puppet.yaml

@@ -350,6 +350,11 @@ parameters:
     default: ''
     description: >-
       OAuth 2.0 introspection endpoint for mod_auth_openidc
+  KeystoneEnableTokenCaching:
+    type: boolean
+    default: false
+    description: >-
+      Enable token caching
 
 resources:
 
@@ -438,6 +443,7 @@ outputs:
                 content: {get_param: KeystoneCredential1}
             keystone::fernet_keys: {get_param: KeystoneFernetKeys}
             keystone::fernet_replace_keys: {get_param: ManageKeystoneFernetKeys}
+            tripleo::profile::base::keystone::enable_token_caching: {get_param: KeystoneEnableTokenCaching}
             keystone::logging::debug:
               if:
               - service_debug_unset

releasenotes/notes/keystone_token_caching-ce02411398a40420.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    A new parameter, KeystoneEnabledTokenCaching is available to enable token
+    caching in keystone, which is disabled by default.