go.crypto: use golang.org/x/... import paths

LGTM=bradfitz
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/167190043

openpgp/clearsign/clearsign.go

@@ -18,9 +18,9 @@ import (
 	"net/textproto"
 	"strconv"
 
-	"code.google.com/p/go.crypto/openpgp/armor"
-	"code.google.com/p/go.crypto/openpgp/errors"
-	"code.google.com/p/go.crypto/openpgp/packet"
+	"golang.org/x/crypto/openpgp/armor"
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/packet"
 )
 
 // A Block represents a clearsigned message. A signature on a Block can

openpgp/clearsign/clearsign_test.go

@@ -6,7 +6,7 @@ package clearsign
 
 import (
 	"bytes"
-	"code.google.com/p/go.crypto/openpgp"
+	"golang.org/x/crypto/openpgp"
 	"testing"
 )