When we moved gossip filtering to connectd, this aging got lost.
Without this, we hit the 10,000 entry limit before expiring full
gossip anti-echo cache. This is under 1M in allocations per peer, but
in DEVELOPER mode each allocation includes adds 3 notifiers (32 bytes
each) and a backtrace child (40 + 40 + 256 bytes), making it almost
10MB per peer, plus allocation overhead.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: connectd: large memory usage with many peers fixed.
ecdfbbf359