Adding tls support ceilometer agent for libvirt

The patch adds TLS support in ceilometer agent in case of
it is enabled for nova compute process.

Change-Id: I86b241bfe59f284c23b3118894e04be6bd6ceede
Related-PROD: PROD-23583
diff --git a/ceilometer/agent/telemetry/cluster.yml b/ceilometer/agent/telemetry/cluster.yml
index 56ca6cc..a110361 100644
--- a/ceilometer/agent/telemetry/cluster.yml
+++ b/ceilometer/agent/telemetry/cluster.yml
@@ -6,12 +6,16 @@
     openstack_rabbitmq_port: 5672
     openstack_rabbitmq_x509_enabled: False
     rabbitmq_ssl_enabled: False
+    ceilometer_agent_ssl_enabled: False
   ceilometer:
     agent:
       region: ${_param:openstack_region}
       enabled: true
       version: ${_param:ceilometer_version}
       secret: ${_param:ceilometer_secret_key}
+      libvirt:
+        ssl:
+          enabled: ${_param:ceilometer_agent_ssl_enabled}
       identity:
         engine: keystone
         host: ${_param:keystone_service_host}