ofp-actions: Avoid logging 64 times as many actions as actually provided.

The following commit adds a test.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
ofp-actions: Use specific error code for oxm_hasmask=1 in Set-Field.

Based on the OpenFlow 1.5 draft.

ONF-JIRA: EXT-425
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>