istio stop hook defer function (#10)

* istio stop hook defer function

* no lint

* Update httputils/istio/stophook.go

Co-authored-by: David Katz <david.katz@mongodb.com>

---------

Co-authored-by: David Katz <david.katz@mongodb.com>

Author: whwalter

httputils/istio/stophook.go

@@ -0,0 +1,16 @@
+package istio
+
+import (
+	"net/http"
+	"time"
+)
+
+// StopHook takes a timeout in milliseconds and sends a request to istio's stop hook.
+// It is intended to be used as a defer function
+func StopHook(timeout int) {
+	c := &http.Client{
+		Timeout: time.Duration(timeout) * time.Millisecond,
+	}
+	r, _ := http.NewRequest("POST", "http://localhost:15000/quitquitquit", nil)
+	c.Do(r) //nolint
+}