We test if DevCentral is up and if every expected service
runs inside the container.
This detects the two main failure case:
- the IRC bot xessife is down
- the Phabricator daemons are down
It introduces a DockerContainer class to run a command inside
a container, after connecting to the relevant server with a
Docker client available by SSH.
Here, ssh dwellers.nasqueron.org docker exec devcentral ps auxw.
To run such privileged access tests, make test-full is introduced.