refactor(bitswap/testnet) extract interface in prep for mockpeernet version

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

exchange/bitswap/testnet/interface.go

+package bitswap
+
+import (
+	bsnet "github.com/jbenet/go-ipfs/exchange/bitswap/network"
+	peer "github.com/jbenet/go-ipfs/peer"
+	"github.com/jbenet/go-ipfs/util/testutil"
+)
+
+type Network interface {
+	Adapter(testutil.Peer) bsnet.BitSwapNetwork
+
+	HasPeer(peer.ID) bool
+}

exchange/bitswap/testnet/network.go

@@ -15,14 +15,6 @@ import (
 	testutil "github.com/jbenet/go-ipfs/util/testutil"
 )
 
-type Network interface {
-	Adapter(testutil.Peer) bsnet.BitSwapNetwork
-
-	HasPeer(peer.ID) bool
-}
-
-// network impl
-
 func VirtualNetwork(rs mockrouting.Server, d delay.D) Network {
 	return &network{
 		clients:       make(map[peer.ID]bsnet.Receiver),