dep: migrate to go-libp2p-core

go.mod

 module github.com/ipfs/go-blockservice
 
 require (
-	github.com/ipfs/go-bitswap v0.0.9
+	github.com/ipfs/go-bitswap v0.1.0
 	github.com/ipfs/go-block-format v0.0.2
 	github.com/ipfs/go-cid v0.0.2
 	github.com/ipfs/go-datastore v0.0.5
@@ -10,10 +10,8 @@ require (
 	github.com/ipfs/go-ipfs-delay v0.0.1
 	github.com/ipfs/go-ipfs-exchange-interface v0.0.1
 	github.com/ipfs/go-ipfs-exchange-offline v0.0.1
-	github.com/ipfs/go-ipfs-routing v0.0.1
+	github.com/ipfs/go-ipfs-routing v0.1.0
 	github.com/ipfs/go-ipfs-util v0.0.1
 	github.com/ipfs/go-log v0.0.1
 	github.com/ipfs/go-verifcid v0.0.1
-	github.com/libp2p/go-libp2p-testing v0.0.2 // indirect
-	golang.org/x/sys v0.0.0-20190524152521-dbbf3f1254d4 // indirect
 )