Handle the hardcoded configuration values

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

Change-Id: I2ed771daa3a64e135b881e18117fbba5f75cbec9
Related-Prod: PROD-29627
diff --git a/README.rst b/README.rst
index d4578dd..4fa35ec 100644
--- a/README.rst
+++ b/README.rst
@@ -160,6 +160,22 @@
 You can read more about it here:
     https://docs.openstack.org/security-guide/databases/database-access-control.html
 
+Configmap configuration:
+----------------
+
+.. code-block:: yaml
+
+  manila:
+    common:
+      configmap:
+        DEFAULT:
+          default_share_type: default_share_type
+          share_name_template: share-%s
+          rootwrap_config: '/etc/manila/rootwrap.conf'
+          api_paste_config: '/etc/manila/api-paste.ini'
+        oslo_concurrency:
+          lock_path: '/var/lock/manila'
+
 More information
 ================