Containers created by s2i should be explicitly named

[rhcarvalho]

From https://github.com/openshift/source-to-image/pull/430/files#r56502920.

Instead of leaving it up to the Docker daemon to give nice names like "fluffly_panda" 🐼, we should do the same as we do in origin and give names with a "s2i" prefix.

Include a random suffix.

[rhcarvalho]

Closing as dupe of #395