ofproto: Ignore generation ID for role change to "equal".
The OpenFlow specification says that only role changes to slave or master check the generation ID, so this is a bug fix. OpenFlow 1.2 section A.3.9 phrases the requirement this way: Additionally, if the role value in the message is OFPCR_ROLE_MASTER or OFPCR_ROLE_SLAVE, the switch must validate generation_id to check for stale messages. Found by OFTest. Signed-off-by: Ben Pfaff <firstname.lastname@example.org>
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