channeld: defer first update_fee until we have an HTLC to send. #3634
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Sending update_fee immediately after channel establishment seems to
upset LND, so work around it by deferring it. The reason we increase
the fee after establishment is because now we might need to close the
channel in a hurry due to htlcs, but until there are htlcs that's
unnecessary.
Workaround for #3596
Signed-off-by: Rusty Russell rusty@rustcorp.com.au