[containertest] Launch container when running go test

[at15]

Need test util for starting and stop containers. Also I can revive the old docker client package ...

TODO

• docker client
  • old client I wrote
• start/stop container
• wait for port ready etc.
• built in support for popular databases

Ref

• https://github.com/ory/dockertest very little code, using https://github.com/fsouza/go-dockerclient
• https://github.com/testcontainers/testcontainers-go it has wait, even for database, which is good (should put in benchhub or just put it here ...)