Added libvirt connection status tag.

ccnode/hypervisor/tags.py

@@ -2,6 +2,11 @@ from ccnode.utils import and_
 from ccnode.hypervisor.lib import vir_tag
 
 
+def vir_status(handl):
+    """Local libvirt connection status."""
+    return {True: 'connected', False: 'disconnected'}[handl.virt_connected]
+
+
 # hypervisor related tags
 def htype():
     """Hypervisor type."""