run each acceptance test in new process
run each acceptance test in new process

Ensure that the cli/client does not end up talking to a server from the
previous test.
treasure-data/digdag,KimuraTakaumi/digdag,KimuraTakaumi/digdag,KimuraTakaumi/digdag,KimuraTakaumi/digdag,treasure-data/digdag,KimuraTakaumi/digdag,treasure-data/digdag,treasure-data/digdag,treasure-data/digdag,treasure-data/digdag,KimuraTakaumi/digdag,treasure-data/digdag