Disable Queue and Retry settings (#72)

These are handled by the statsd package.
OpenTelemetry docs are confusing and the default configuration (disabled)
is different from the one returned by "GetDefault..." functions

exporter/datadogexporter/dogstatsd.go

@@ -93,9 +93,9 @@ func (exp *dogStatsDExporter) GetConfig() *Config {
 }
 
 func (exp *dogStatsDExporter) GetQueueSettings() exporterhelper.QueueSettings {
-	return exporterhelper.CreateDefaultQueueSettings()
+	return exporterhelper.QueueSettings{Enabled: false}
 }
 
 func (exp *dogStatsDExporter) GetRetrySettings() exporterhelper.RetrySettings {
-	return exporterhelper.CreateDefaultRetrySettings()
+	return exporterhelper.RetrySettings{Enabled: false}
 }