classifier: classifier_lookup_miniflow_batch() indicated failures.

This patch causes classifier_lookup_miniflow_batch() to return a
boolean indicating whether any rules could not be successfully looked
up.  Used in future patches.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
flow add should take a match for efficiency
Allow optional odp_actions pointer
Handle upcall initialization in a sane manner.

Clean up the upcall receive pipeline
Working