feat(dns): replace unbound with qdm12/dns@v2.0.0-beta-rc6 (#1742)

- Faster start up
- Clearer error messages
- Allow for more Gluetun-specific customization
- DNSSEC validation is dropped for now (it's sort of unneeded)
- Fix #137

internal/server/handlerv0.go

@@ -42,7 +42,7 @@ func (h *handlerV0) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		if _, err := w.Write([]byte("openvpn restarted, please consider using the /v1/ API in the future.")); err != nil {
 			h.logger.Warn(err.Error())
 		}
-	case "/unbound/actions/restart":
+	case "/unbound/actions/restart": // TODO v4 change to /dns/
 		outcome, _ := h.dns.ApplyStatus(h.ctx, constants.Stopped)
 		h.logger.Info("dns: " + outcome)
 		outcome, _ = h.dns.ApplyStatus(h.ctx, constants.Running)