Update compute.discovery to get nova domain meta

Nova changed the namespace for nova specific
data to version 1.1 for the wallaby cycle .

Closes-Bug: #1930446
Change-Id: I2aa34cf142c6429a7a0a3b8f232c3ed83f7d9981

ceilometer/compute/discovery.py

@@ -140,7 +140,7 @@ def discover_libvirt_polling(self, manager, param=None):
             try:
                 xml_string = domain.metadata(
                     libvirt.VIR_DOMAIN_METADATA_ELEMENT,
-                    "http://openstack.org/xmlns/libvirt/nova/1.0")
+                    "http://openstack.org/xmlns/libvirt/nova/1.1")
             except libvirt.libvirtError as e:
                 if libvirt_utils.is_disconnection_exception(e):
                     # Re-raise the exception so it's handled and retries