Use native go method to get current user rather than environment variable (#4930)

* Use native go method to get current user rather than environment var

* Use t.Skip instead of return in test

modules/user/user.go

@@ -4,10 +4,29 @@
 
 package user
 
-import "os"
+import (
+	"os"
+	"os/user"
+	"runtime"
+	"strings"
+)
 
 // CurrentUsername return current login OS user name
 func CurrentUsername() string {
+	userinfo, err := user.Current()
+	if err != nil {
+		return fallbackCurrentUsername()
+	}
+	username := userinfo.Username
+	if runtime.GOOS == "windows" {
+		parts := strings.Split(username, "\\")
+		username = parts[len(parts)-1]
+	}
+	return username
+}
+
+// Old method, used if new method doesn't work on your OS for some reason
+func fallbackCurrentUsername() string {
 	curUserName := os.Getenv("USER")
 	if len(curUserName) > 0 {
 		return curUserName