Fix table checking for goto table instruction.

Fix table checking for goto table instruction.

Usually the table id in flow mods is 255, which means that goto table
instruction cannot be checked before the table is picked (for flow add),
or the rules to be modified are found (flow mod).

Move goto table checking from decode (ofp-util) to actions checking
(ofp-actions), and postpone the action checking until the table in
which the actions are added is known.

This fixes OFPBRC_BAD_TABLE_ID errors for flow adds that specify the table
id as 255, and have a goto table instruction.

Signed-off-by: Jarno Rajahalme <jarno.rajahalme@nsn.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>