Open source test infrastructure

[hinshun]

Currently I'm benchmarking p2p pull using a variety of internal code to:

• Run containerd with ipcs
• Populate a containerd-ipcs cluster by sharding an image across the nodes
• Compare a normal pull from a Docker Registry against a p2p pull via sharding the chunked IPLD nodes across the cluster

I need to open source those components and write an automated performance test suite, because I want upstream to include ipcs as a "real world usecase".

Things that would help upstream to test:

• Easy ability to convert DockerHub images so they have an IPLD graph of alpine or ubuntu (variety of small and big images with little and many layers).
• Test harness for ipcs