(split)add more tests around eckey chaining
(split)add more tests around eckey chaining

Change-Id: Ibd396283edb39e942a48b5e390bfde0d810d1334
Reviewed-on: https://cr.twist.com/r/14812
Reviewed-by: Mike Belshe <a17fed27eaa842282862ff7c1b9c8395a26ac320@twist.com>
Tested-by: Mike Belshe <a17fed27eaa842282862ff7c1b9c8395a26ac320@twist.com>

mbelshe/oldbitcoinjslib,mbelshe/oldbitcoinjslib