p2p: NodeInfo is an interface; General cleanup (#2556)

* p2p: NodeInfo is an interface

* (squash) fixes from review

* (squash) more fixes from review

* p2p: remove peerConn.HandshakeTimeout

* p2p: NodeInfo is two interfaces. Remove String()

* fixes from review

* remove test code from peer.RemoteIP()

* p2p: remove peer.OriginalAddr(). See #2618

* use a mockPeer in peer_set_test.go

* p2p: fix testNodeInfo naming

* p2p: remove unused var

* remove testRandNodeInfo

* fix linter

* fix retry dialing self

* fix rpc

node/node.go

@@ -761,8 +761,8 @@ func makeNodeInfo(
 	if _, ok := txIndexer.(*null.TxIndex); ok {
 		txIndexerStatus = "off"
 	}
-	nodeInfo := p2p.NodeInfo{
-		ID:      nodeID,
+	nodeInfo := p2p.DefaultNodeInfo{
+		ID_:     nodeID,
 		Network: chainID,
 		Version: version.Version,
 		Channels: []byte{
@@ -772,7 +772,7 @@ func makeNodeInfo(
 			evidence.EvidenceChannel,
 		},
 		Moniker: config.Moniker,
-		Other: p2p.NodeInfoOther{
+		Other: p2p.DefaultNodeInfoOther{
 			AminoVersion:     amino.Version,
 			P2PVersion:       p2p.Version,
 			ConsensusVersion: cs.Version,