Stale lease data after ICMP ping before offer?

[Jerimiah Cole]

I have a situation where a client in a class with 'lease-limit 2' is
being refused a lease after the server abandons 2 IPs due to ICMP ping
before offer.  See the attached log.  The server continues to refuse the
client a lease until the server is restarted.

It appears that the server is counting the abandoned addresses against
the client's lease-limit.  It doesn't write any data about the abandoned
addresses to disk, so simply restarting the server seems to clear the
broken associations.

The server version is 3.0.3.  I didn't see anything mentioned in the
change logs between 3.0.3 and 3.1.0.  I'm confident I can reproduce the
problem in a test environment and test against 3.1.0 if necessary.

Jerimiah
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