Add NovaApiMaxLimit configure max_limit for nova

Currently, we can't set Nova [api]/max_limit
using a supplied Heat parameter. This change
adds a Heat parameter that will make it easier
for users to configure max_limit in nova.conf.

Change-Id: I4c28c6c90c52f22d4fa81d13e85842ce876ec2b9
closes-bug: 1904096
(cherry picked from commit 603530c711)

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

@@ -101,6 +101,10 @@ parameters:
     default: false
     description: Allow destination machine to match source for resize.
     type: boolean
+  NovaApiMaxLimit:
+    default: 1000
+    description: Max number of objects returned per API query
+    type: number
 
 parameter_groups:
 - label: deprecated
@@ -194,6 +198,7 @@ outputs:
             nova::keystone::authtoken::auth_url: {get_param: [EndpointMap, KeystoneInternal, uri_no_suffix]}
             nova::keystone::authtoken::region_name: {get_param: KeystoneRegion}
             nova::keystone::authtoken::interface: 'internal'
+            nova::api::max_limit: {get_param: NovaApiMaxLimit}
             nova::api::enabled: true
             nova::api::default_floating_pool: {get_param: NovaDefaultFloatingPool}
             nova::api::enable_proxy_headers_parsing: true

releasenotes/notes/nova_api_max_limit-support-43fe9792eca63599.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The NovaApiMaxLimit parameter allows the operator to set Nova API
+    max_limit using a Heat parameter in their templates.