Improve pod logs related to Supervisor TLS certificate problems

internal/httputil/requestutil/requestutil.go

@@ -0,0 +1,14 @@
+// Copyright 2023 the Pinniped contributors. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package requestutil
+
+import "net/http"
+
+func SNIServerName(req *http.Request) string {
+	name := ""
+	if req.TLS != nil {
+		name = req.TLS.ServerName
+	}
+	return name
+}