Set libvirt_nonblocking to true by default for Folsom.

Make the fake libvirt module look more like the real module.

Change-Id: Ie03f24c6e5c3027d83d8f3d87d049f7f9df29e5b

nova/tests/fakelibvirt.py

@@ -797,3 +797,9 @@ def openAuth(uri, auth, flags):
                           "this auth method"))
 
     return Connection(uri, readonly=False)
+
+
+virDomain = Domain
+
+
+virConnect = Connection