use server and username for certificate subject and issuer

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>

utils/utils.go

@@ -3,6 +3,7 @@ package utils
 import (
 	"io"
 	"os"
+	"os/user"
 	"path/filepath"
 	"runtime"
 )
@@ -26,6 +27,15 @@ func GetMachineClientCertDir() string {
 	return filepath.Join(GetMachineDir(), ".client")
 }
 
+func GetUsername() (string, error) {
+	u, err := user.Current()
+	if err != nil {
+		return "", err
+	}
+
+	return u.Username, nil
+}
+
 func CopyFile(src, dst string) error {
 	in, err := os.Open(src)
 	if err != nil {