Parametrize OPENSTACK_SSL_NO_VERIFY configuration option

Issue: PROD-20715

Change-Id: Ic7153af27c549dddbcaec22028f9d843069df8d8
diff --git a/README.rst b/README.rst
index 1f90438..71fa431 100644
--- a/README.rst
+++ b/README.rst
@@ -105,7 +105,9 @@
         secure: True
 
 
-Horizon package setup with SSL
+Horizon package setup with SSL.
+
+Important: for the sake of backwards compatibility `ssl_no_verify` attribute defaults to True when horizon:server:identity:encryption is set to 'ssl'.
 
 .. code-block:: yaml
 
@@ -114,6 +116,7 @@
         enabled: true
         secret_key: MEGASECRET
         version: juno
+        ssl_no_verify: false
         ssl:
           enabled: true
           authority: CA_Authority