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OpenFlow 1.4 introduces the ability to turn on flow table eviction with an OFPT_TABLE_MOD message specifying OFPTC_EVICTION. It also adds related machinery to other messages that mention OFPTC_* fields. This commit adds support for the new feature, implementing it as a second, parallel way to enable flow table eviction. It takes more work than it seems like it should because there is so much weirdness with the treatment of OFPTC_* flags over the evolution of OpenFlow; please refer to the explanation in DESIGN.md for more information. This commit also adds related support to ovs-ofctl, plus tests. Signed-off-by: Ben Pfaff <blp@nicira.com> Co-authored-by: Saloni Jain <saloni.jain@tcs.com> Signed-off-by: Saloni Jain <saloni.jain@tcs.com> Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>