Make root_helper_daemon as an option

Give an ability to disable this option
if packages from UCA repository are used.

Change-Id: I4cc6cce4868ea95e806ce4b41069805fb995dcdb
diff --git a/README.rst b/README.rst
index 5532662..16a261d 100644
--- a/README.rst
+++ b/README.rst
@@ -26,6 +26,7 @@
         api_workers: 2
         rpc_workers: 2
         rpc_state_report_workers: 2
+        root_helper_daemon: false
         bind:
           address: 172.20.0.1
           port: 9696