This extracts glue code that simplifies running interop against
unreleased code of go-ipfs and js-ipfs packages from lerna monorepo.

Makes it easier to demonstrate green CI and/or test end-to-end locally
before submitting a PR.

the Rube Goldberg machine for testing HTTP RPC wire format
changes end-to-end

This ensures we run interop with official binary that is provided to
regular users.

It also removes the need for `go` binary when running in CI in js-ipfs
repo.