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We need to regenerate the fallback directory mirror list in 0.2.9 in case any of the 0.2.8 fallbacks have changed details or gone down.

This should not require another opt-in mailout, as we had ~70 additional fallbacks in 0.2.8 that were suitable but not selected.

We should also:

• restore the 120 day stability period and 99% uptime requirement that were reduced in 0.2.8 due to #18050 (moved)
• check the bandwdith range in the script's generated C comments
• check the IP version, netblock, port, and Exit flag proportions in the script's stderr output

Over the longer term, we could:

• reconsider whether to allow 2 fallbacks per operator (contact, family), while keeping 1 per IP
• decide whether to change to an opt-out system, where we includes fallbacks unless operators specifically opt-out