misc(crypto) remove stale test

@jbenet

Handshake library has been modified to use Secure Pipe. This test
targets the old implementation.

TODO: write a new handshake test

crypto/spipe/identify_test.go

-package spipe
-
-import (
-	"testing"
-
-	ci "github.com/jbenet/go-ipfs/crypto"
-	"github.com/jbenet/go-ipfs/peer"
-)
-
-func TestHandshake(t *testing.T) {
-	ska, pka, err := ci.GenerateKeyPair(ci.RSA, 512)
-	if err != nil {
-		t.Fatal(err)
-	}
-	skb, pkb, err := ci.GenerateKeyPair(ci.RSA, 512)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	cha := make(chan []byte, 5)
-	chb := make(chan []byte, 5)
-
-	ida, err := IDFromPubKey(pka)
-	if err != nil {
-		t.Fatal(err)
-	}
-	pa := &peer.Peer{
-		ID:      ida,
-		PubKey:  pka,
-		PrivKey: ska,
-	}
-
-	idb, err := IDFromPubKey(pkb)
-	if err != nil {
-		t.Fatal(err)
-	}
-	pb := &peer.Peer{
-		ID:      idb,
-		PubKey:  pkb,
-		PrivKey: skb,
-	}
-
-	go func() {
-		_, _, err := Handshake(pa, pb, cha, chb)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}()
-
-	_, _, err = Handshake(pb, pa, chb, cha)
-	if err != nil {
-		t.Fatal(err)
-	}
-}