canned etcd

[gianarb]

Lisa from Influx wrote this etcd container request for one of our tests. Probably we can make it to be a canned container as well.

	reqEtcd := ContainerRequest{
		Image: "quay.io/coreos/etcd:v3.2",
		WaitingFor: wait.ForAll(
			wait.ForLog("listening for client requests on 0.0.0.0:2379"),
		),
		ExposedPorts: []string{"2379/tcp", "4001/tcp"},
		SkipReaper:   true,
	}

[achew22]

Has there been any consideration of creating a text format that could be shared among the various testcontainers projects rather than having a disparate set for each library?

[mdelapenya]

We started this PR, which could be the seed for modules: #618

It creates examples to be consumed by the website, but turning them into modules would be a matter of adjusting the templates.

[mdelapenya]

Given #618 has been merged, we created #636, where you can find how to contribute new modules :)