more overly-severe warnings

[Ross Boylan]

While I'm on the topic, here's another message that doesn't seem as if it 
should be a Security Event, and probably isn't worth reporting at all:

Security Events
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May 22 04:01:00 corn cyrus/tls_prune[24196]: DBERROR db4: 4 lockers

Here's the current, closely related, pattern (single line in original):
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ cyrus/(imaps?|pop3s?|lmtp|
lmtpunix)\[[0-9]+\]: DBERROR db[34]: [0-9]+ lockers$
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Security Events
=-=-=-=-=-=-=-=
May 22 04:01:00 corn cyrus/tls_prune[24196]: DBERROR db4: 4 lockers