Seems like sleep(1) isn't always enough. Give in and put a log
message there, and use that:
```
waitfut = executor.submit(l2.rpc.wait, subsystem='forwards', indexname='deleted', nextvalue=1)
time.sleep(1)
l2.rpc.delforward(scid12, 1, 'failed')
waitres = waitfut.result(TIMEOUT)
> assert waitres == {'subsystem': 'forwards',
'deleted': 1,
'forwards': {'in_channel': scid12,
'in_htlc_id': 1,
'status': 'failed'}}
E AssertionError: assert {'subsystem': 'forwards', 'deleted': 1} == {'subsystem': 'forwards', 'deleted': 1, 'forwards': {'in_channel': '103x2x0', 'in_htlc_id': 1, 'status': 'failed'}}
E
E Common items:
E {'deleted': 1, 'subsystem': 'forwards'}
E Right contains 1 more item:
E {'forwards': {'in_channel': '103x2x0', 'in_htlc_id': 1, 'status': 'failed'}}
E
E Full diff:
E {
E 'deleted': 1,
E - 'forwards': {
E - 'in_channel': '103x2x0',
E - 'in_htlc_id': 1,
E - 'status': 'failed',
E - },
E 'subsystem': 'forwards',
E }
tests/test_misc.py:3599: AssertionError
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
3be25d48d3