ece457c62f
The docker service is socket activated by default; thus,
`waitForUnit("docker.service")` before any docker command causes the
unit test to time out.
Instead, do `waitForUnit("sockets.target")` to ensure that sockets are
setup before running docker commands.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.