Adding tls support for libvirt

The patchs adds TLS support in case of it is enabled for
nova compute process.

Change-Id: Ie14de155befc2f042f5425c22c4913a2b0f1913c
Related-PROD: PROD-23583
diff --git a/README.rst b/README.rst
index 0ca4467..4c1d819 100644
--- a/README.rst
+++ b/README.rst
@@ -188,6 +188,10 @@
           tenant: service
           user: ceilometer
           password: pwd
+        libvirt:
+          ssl:
+            enabled: true
+          libvirt_uri: qemu+tls://
         message_queue:
           engine: rabbitmq
           host: 127.0.0.1