We also document this in the listnetworkevents command itself.
The test_autoclean_once was getting repetitive, so I cleaned that
up too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: `autoclean` will remove networkevents after 30 days by default.
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).
ec05e5da91