☂ Remove various _filename records.config variables.

[zwoop]

This turned out to be a little more complicated than expected, because these records.config are actually used as part of the mechanisms for reloading configuration files. But we should get this done for ATS v10.

• [x] proxy.config.cache.storage_filename
• [ ] proxy.config.cache.control.filename
• [ ] proxy.config.cache.ip_allow.filename
• [ ] proxy.config.cache.hosting_filename
• [ ] proxy.config.cache.volume_filename
• [ ] proxy.config.dns.splitdns.filename
• [ ] proxy.config.hostdb.filename
• [ ] proxy.config.log.config.filename
• [ ] proxy.config.url_remap.filename
• [ ] proxy.config.ssl.server.multicert.filename
• [ ] proxy.config.ssl.servername.filename

The argument is that

1. This doesn't fly well with the move to a unified YAML namespace
2. This functionality is superseded with the traffic layout / runroot features.

[zwoop]

Blocks #5457

[zwoop]

Moving out to 10.0.0, unless someone wants to work on this.

[randall]

@zwoop I could.

~~Do you have any ideas here around the config file to config subsystem signaling here?~~

I have an idea here. Let me see if I can do it in the next few days.

[github-actions[bot]]

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