Comment on AsyncNotifier upstream's availability

Since we contributed AsyncNotifier back to the upstream pyinotify
project, we'll be able, one day, to remove the ganeti version of that
code. For now we still need it to support older distributions, but
having a note about when we'll be able to remove it is nice.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

lib/asyncnotifier.py

@@ -31,6 +31,9 @@ except ImportError:
   import pyinotify
 
 
+# We contributed the AsyncNotifier class back to python-pyinotify, and it's
+# part of their codebase since version 0.8.7. This code can be removed once
+# we'll be ready to depend on python-pyinotify >= 0.8.7
 class AsyncNotifier(asyncore.file_dispatcher):
   """An asyncore dispatcher for inotify events.