[FAB-8757] add Issuer/Subject field to peer.cert

Adds the Subject field to the template used to create
the peer.crt generated for a chaincode. Since the
cert is self-signed, this also sets the Issuer field.

Change-Id: I4465f3df3415e16dbadaef88c23caf70bf114272
Signed-off-by: Luis Sanchez <sanchezl@us.ibm.com>

Author: Luis Sanchez

core/chaincode/accesscontrol/key.go

@@ -12,6 +12,7 @@ import (
 	"crypto/elliptic"
 	"crypto/rand"
 	"crypto/x509"
+	"crypto/x509/pkix"
 	"encoding/base64"
 	"encoding/pem"
 	"math/big"
@@ -53,6 +54,7 @@ func newCertTemplate() (x509.Certificate, error) {
 		return x509.Certificate{}, err
 	}
 	return x509.Certificate{
+		Subject:      pkix.Name{SerialNumber: sn.String()},
 		NotBefore:    time.Now().Add(time.Hour * (-24)),
 		NotAfter:     time.Now().Add(time.Hour * 24),
 		KeyUsage:     x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,