ofproto-dpif-xlate: Add a mechanism to skip wildcard calculation.
As time goes on and the classifier becomes more complicated, calculate
the wildcard mask will get more and more expensive. This patch adds a
mechanism to xlate_actions() allowing callers to disable wildcard
calculation when it isn't really necessary. Used in future patches.
Signed-off-by: Ethan Jackson <ethan@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>