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Flush chttpd_db monitor refs on demonitor
This ensures that the coordinator process flushes on demonitoring of the attachment refs in chttpd_db. The problem here is that it's possible to receive a 'DOWN' message for the monitor ref that is not receive'ed, causing it to stick around in the coordinator message queue while the next http request is handled. The pending message will not become apparent until the next fabric call is invoked, as fabric expects to have full access to all messages in the calling process, an expectation which is violated by the pending message and causes a case clause crash in the fabric receive message callbacks. I noticed this during eunit runs with stubbed attachment handles that generate an immediate noproc message on the monitor call. Normal operations should not result in an immediate noproc result on monitoring the attachment process, however, any failure that causes the attachment process to fail between acquisition of the refs and the demonitor calls will induce this bug, causing the next http request handled by the particular chttpd coordinator pool processs to fail on whatever next fabric call is made.
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