increase portability of tests

[dgoffredo]

I was working on a side project last weekend that had me running make test on my personal laptop. It failed.

The reason was that docker-compose on that laptop prefixes messages like "Creating container [...] ..." with a space, so it's " Creating container [...] ...". orchestration.py was thus failing to recognize such lines and indicating that a container was created, and so the test driver was spinning forever waiting for things to come up.

This revision fixes that by adding the prefix \s* to all relevant regex patterns.

Another issue was how docker-compose ps works. The tests were written to expect that when docker-compose ps <service> has nothing to say, then the command will exit with a nonzero status. On my personal laptop, this is not true. So, now we wait for the condition "nonzero exit status and nonempty output." Five retries is no longer enough, so I increased it to 100.

Finally, I changed all mentions of docker-compose to be instead docker compose. They are different, though on CircleCI I think that docker-compose was just a wrapper that forwarded to docker compose. The original Python docker-compose is completely replaced by Docker's "compose" plugin (docker compose, written in Go).

The tests now pass on my personal laptop. Let's see what CircleCI thinks of these changes.

[cgilmour]

This looked like it's mostly s/docker-compose/docker compose

[cgilmour]

You might need to rebase and sign the commits to make it mergeable

[dgoffredo]

thanks, Caleb