OPENFLOW-1.1+: Remove "rework tag order" and MPLS BoS matching from OF1.3.

OpenFlow 1.3.4 is going to revert the tag order change made by OpenFlow
1.3.

MPLS BoS matching is implemented.

Signed-off-by: Ben Pfaff <blp@nicira.com>
OPENFLOW-1.1+: Update status of a few items.

Signed-off-by: Ben Pfaff <blp@nicira.com>