chore: test trickle DAG parity with go-ipfs

[pgte]

Once go-ipfs trickle DAG corrects this issue, test whether the generated hashes are the same.

[achingbrain]

We have this interop test that does this: https://github.com/ipfs/interop/blob/master/test/files.js#L314-L327

It doesn't assert the type of leaf node, but it does assert that the generated hashes are the same.

Other tests assert that we can specify a leaf node type as a config option.

[alanshaw]

Sounds like this is resolved! Thanks @achingbrain 👏