With the previous commit this enables py.test on travis, which should
give us some better way of hunting down bugs on travis.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
This was causing intermittent `rawtransactiondecode` errors see
ElementsProject/lightning#332
Reported-by: @achow101
Signed-off-by: Christian Decker <decker.christian@gmail.com>