Formula improvements

     * Add poss. to disable|enable one mirror
     * Add retry for module. Usefull, at unstable networking.

Change-Id: I9a03e3f17be2331ed16b3babda6f671fb94f6003
Closes-Bug: PROD-21610 (PROD:21610)
diff --git a/README.rst b/README.rst
index f53682f..4c1b825 100644
--- a/README.rst
+++ b/README.rst
@@ -5,6 +5,7 @@
 This file provides the debmirror sample pillars configurations for different
 use cases.
 
+See debmirror/schemas/*.yaml for all possible options
 A sample of one debmirror mirror configuration (Ubuntu):
 
 .. code-block:: yaml
@@ -15,6 +16,8 @@
           enabled: true
           mirrors:
             target01:
+              enabled: true
+              fetch_retry: 3
               http_proxy : "url"
               https_proxy: "url"
               ftp_proxy: "url"