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GRAVITL

<@816758878980276224> Last time when working on the Jenkins go test, do found this:  fmt.Fprintln arg list ends with redundant newline

I just reading the code, actually the const already has a newline, and Fprintln created another new line.

```go
// == define error HTML here ==
const oauthNotConfigured = `<!DOCTYPE html><html>
<body>
<h3>Your Netmaker server does not have OAuth configured.</h3>
<p>Please visit the docs <a href="https://docs.netmaker.org/oauth.html" target="_blank" rel="noopener">here</a> to learn how to.</p>
</body>
</html>
`

// HandleAuthCallback - handles oauth callback
func HandleAuthCallback(w http.ResponseWriter, r *http.Request) {
    if auth_provider == nil {
        w.Header().Set("Content-Type", "text/html; charset=utf-8")
        fmt.Fprintln(w, oauthNotConfigured)
        return
    }
```

The fix can be:
```go
// == define error HTML here ==
const oauthNotConfigured = `<!DOCTYPE html><html>
<body>
<h3>Your Netmaker server does not have OAuth configured.</h3>
<p>Please visit the docs <a href="https://docs.netmaker.org/oauth.html" target="_blank" rel="noopener">here</a> to learn how to.</p>
</body>
</html>`
```

Let me know if you guys want to fix this  🙂
I think totally two places has this issue, if fix it then no complain in any CI/CD with go test.