Exchanges: Add config variable to set bypassing of orderbook verification by exchange (#614)

* Exchanges: Add config variable to set bypassing of orderbook verification

* Exchanges: Consolidate orderbook variables into config struct

* Exchanges: Addr nit; set verification bypass on websocket book implementations

exchanges/exchange_types.go

@@ -218,6 +218,7 @@ type Base struct {
 	WebsocketOrderbookBufferLimit int64
 	Websocket                     *stream.Websocket
 	*request.Requester
-	Config        *config.ExchangeConfig
-	settingsMutex sync.RWMutex
+	Config                      *config.ExchangeConfig
+	settingsMutex               sync.RWMutex
+	OrderbookVerificationBypass bool
 }