Handle the hardcoded configuration values

This patch allows to customize the hardcoded configuration values,
as well as introduce new configuration options for nova services
by configmap template

Change-Id: I1f81b5dfbe927f9019afb1e236abbc9bd3b0d6de
Related-Prod: PROD-29040
diff --git a/README.rst b/README.rst
index 27d6dd7..0f6117d 100644
--- a/README.rst
+++ b/README.rst
@@ -1343,6 +1343,29 @@
          username: nova
          password: pswd
 
+Change default resource quotas using configmap template settings
+========
+
+.. code-block:: yaml
+
+    nova:
+      controller:
+        configmap:
+          quota:
+            instances: 10
+            cores: 20
+            ram: 51200
+            metadata_items: 128
+            injected_files: 5
+            injected_file_content_bytes: 10240
+            injected_file_path_length: 255
+            key_pairs: 100
+            server_groups: 10
+            server_group_members: 10
+            reservation_expire: 86400
+            until_refresh: 0
+            max_age: 0
+
 Upgrades
 ========