Adding Libvirt Module which displays count of active libvirt VMs.

requires 'libvbirt'

bumblebee/modules/libvirtvms.py

@@ -0,0 +1,30 @@
+"""Displays count of running libvirt VMs.
+Required the following python packages:
+        * libvirt
+        * sys
+"""
+import sys
+import libvirt
+import bumblebee.input
+import bumblebee.output
+import bumblebee.engine
+
+
+class Module(bumblebee.engine.Module):
+    def __init__(self, engine, config):
+        super(Module, self).__init__(engine, config,
+            bumblebee.output.Widget(full_text=self.status)
+            )
+        self._status = self.status
+        engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE,
+            cmd="virt-manager")
+
+    def update(self, widgets):
+        self._status = self.status
+
+    def status(self, _):
+        conn = None
+        conn = libvirt.openReadOnly(None)
+        if conn == None:
+            print ('Failed to open connection to the hypervisor')
+        return "VMs %s" % (conn.numOfDomains())