Fix compatibility with Pyinotify 0.8

I didn't know why the code previously used
“pyinotify.EventsCodes.ALL_FLAGS” instead of using the flags from
“pyinotify.EventsCodes” directly. Turns out that Pyinotify 0.8 has them
in “pyinotify”, not “pyinotify.EventsCodes”.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>