Importantly, they're now entirely block driven. We don't use
dev-setmocktime at all any more.
This also fixes a bug if we run the test twice against the same
bitcoind; we need to extract the time from the block header rather
than assuming bitcoind is on the current time.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This means running 3 bitcoinds, which is slow enough to start on my laptop
that I need to increase the startup wait for 30 to 60 seconds, and similarly
the test.sh check loop.
Before: real 13m42.868s
After: real 8m19.563s (make -j3)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
