We add an attempt number to the test directory to improve the test-isolation and
allow for multiple reruns of the same test, without re-using any of the
lightning-dirs or bitcoin-datadirs.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
This is the first example of the py.test style fixtures which should allow us to
write much cleaner and nicer tests.
Signed-off-by: Christian Decker <decker.christian@gmail.com>