update libp2p for stream closure refactor

[Stebalien]

Depends on:

• feat: update to go-libp2p-core 0.7.0 interface changes libp2p/go-libp2p#1001
• improve negotiation flushing multiformats/go-multistream#52
• feat: update to go-libp2p-core 0.7.0 libp2p/go-libp2p-pubsub#385
• feat: update for go-libp2p-core 0.7.0 interface changes go-bitswap#445
• feat: update to go-libp2p-core 0.7.0 libp2p/go-libp2p-kad-dht#693
• feat: use go-libp2p-core 0.7.0 stream interfaces libp2p/go-libp2p-gostream#60
• feat: use go-libp2p-core 0.7.0 stream interfaces go-graphsync#116
• feat: use new stream interfaces from go-libp2p-core 0.7.0 libp2p/go-libp2p-pubsub-router#81

[aschmahmann]

Are any changes to the /p2p folder required? e.g. In ipfs p2p close calling Close instead of Reset?

[Stebalien]

Hm. Yes, we need to call CloseWrite and CloseRead in some cases.

[Stebalien]

Ah, now I remember. I wrote some patches a while ago to fix this.

[Stebalien]

Actually, the p2p code was wrong (I think?) because it didn't wait for an EOF. Now it's more correct because "close" actually closes the stream in both directions.

Ideally, we'd support half-open streams instead of closing the streams in both directions, but that's very tricky to get right and probably not worth it for now.

[Stebalien]

This should be ready to merge.

[Stebalien]

Ok, it was a but in bitswap. All fixed.