Document device.listen_addr and Handling Twisted Web Logs

[nbuuckssi]

Proposed changes

This PR documents what I learned about Twisted HTTP logs that continued to appear in my host's syslog despite removing the default Syslog and Console handler's from my OpenCanary installation's configuration. This duplication of HTTP logs was undesirable because another security tool was capturing both the syslog and the JSON logged by my OpenCanary configuration to a rotating file in /var/log.

This PR also documents the seemingly-undocumented device.listen_addr configuration option added in #337.

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[nbuuckssi]

I suppose it's worth considering whether device.listen_addr should just be added to the default configuration file in lieu of adding the table presently in this PR. The table has the advantage of being able to explain the caveat that it only applies to certain modules.

[thinkst-francois]

Thank you for the update.