It seems many point in the internal API and openstack.common changed, but
this binary has been forgotten.
Also, context ie needed when using the notifier, so import it.
This fixes bug #1053502
Change-Id: I306b8671e7b0ed8c2ce2548a51a4c5e6393e13cb
Signed-off-by: Julien Danjou <julien@danjou.info>