revalidator: Complain for more ukey transitions.

For most ukey transition states, only one thread should be responsible
for transitioning the ukey into the new state. If another thread
attempts to transition the ukey into the same state (for instance,
evicting the datapath flow or deleting the ukey), then it is likely
performing additional work which should only happen once. Log all cases
of ukey transition into the current state, except for UKEY_OPERATIONAL
-> UKEY_OPERATIONAL which regularly occurs when revalidating ukeys.

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Jarno Rajahalme <jarno@ovn.org>

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