bridge: Eject NORMAL flows without a learning entry from datapath.

When revalidating NORMAL flows we consult the learning table, which
could be empty if a packet hasn't come to userspace in a while or we
just did a bridge flush.  If there is no learning entry then existing
flows will begin flooding packets until a new flow is setup.  The
problem is worse with bonding because we can receive one of the flooded
packets back on a bond slave and learn that port, causing us to send
traffic to the wrong location.

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