Add interface-go-ipfs-core tests using the go-ipfs-http-client

[Stebalien]

We should cross-test js-ipfs using the interface-go-ipfs-core test suite and the go-ipfs-http-client. This will currently fail as go-ipfs-http-client uses the streaming API but writing this integration is a good starting point.

[Stebalien]

@magik6k any interest in taking this on?

[magik6k]

I'm not sure how we should integrate those 2 test suites. Should this just be 2 separate things, or should JS somehow invoke Go tests?

[Stebalien]

I'm thinking two separate things. JS will spin up a js node and a go node and run it's test. Go will spin up a js node and a go node (using IPTB) and run the go tests (separately).