Simply wait if there's one going already. This is a minor
optimization, but critical for the case where we do partial refreshes
asynchonously (rather than deleting everything and reloading). This
is currently only coinmoves and chainmoves, but the duplicated effort
is a waste everywhere.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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).
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