Eliminate logspam using filelog monitor

[skaven81]

When using a filelog monitor, the top-level pluginConfig.message filter provides a limited stream of log events to be checked against the rules[].pattern. I thus expect it to be normal for most log events to fail to match the top-level pluginConfig.message filter. Such a condition should not trigger a warning-level log message. And in fact such log messages should be suppressed by default, unless -v=5 or higher is used for troubleshooting/debug purposes.

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[hakman]

/ok-to-test