[FAB-16873] fix cryptogen server TLS to admins

- fixed cryptogen allocates server TLS certificates to admin users
when nodeOU is enabled.

Change-Id: If79a5c5860cbc0c9713cabb891d6737b7bacbaec
Signed-off-by: Chongxin Luo <Chongxin.Luo@ibm.com>

common/tools/cryptogen/msp/generator.go

@@ -147,7 +147,7 @@ func GenerateLocalMSP(baseDir, name string, sans []string, signCA *ca.CA,
 
 	// rename the generated TLS X509 cert
 	tlsFilePrefix := "server"
-	if nodeType == CLIENT {
+	if nodeType == CLIENT || nodeType == ADMIN {
 		tlsFilePrefix = "client"
 	}
 	err = os.Rename(filepath.Join(tlsDir, x509Filename(name)),