exchanges/engine: Add multichain deposit/withdrawal support (#794)

* Add exchange multichain support

* Start tidying up

* Add multichain transfer support for Bitfinex and fix poloniex bug

* Add Coinbene multichain support

* Start adjusting the deposit address manager

* Fix deposit tests and further enhancements

* Cleanup

* Add bypass flag, expand tests plus error coverage for Huobi

Adjust helpers

* Address nitterinos

* BFX wd changes

* Address nitterinos

* Minor fixes rebasing on master

* Fix BFX acceptableMethods test

* Add some TO-DOs for 2 tests WRT races

* Fix acceptableMethods test round 2

* Address nitterinos

exchanges/gemini/gemini_test.go

@@ -23,8 +23,6 @@ import (
 const (
 	apiKey                  = ""
 	apiSecret               = ""
-	apiKeyRole              = ""
-	sessionHeartBeat        = false
 	canManipulateRealOrders = false
 )
 
@@ -487,6 +485,7 @@ func TestModifyOrder(t *testing.T) {
 func TestWithdraw(t *testing.T) {
 	t.Parallel()
 	withdrawCryptoRequest := withdraw.Request{
+		Exchange:    g.Name,
 		Amount:      -1,
 		Currency:    currency.BTC,
 		Description: "WITHDRAW IT ALL",
@@ -545,7 +544,7 @@ func TestWithdrawInternationalBank(t *testing.T) {
 
 func TestGetDepositAddress(t *testing.T) {
 	t.Parallel()
-	_, err := g.GetDepositAddress(context.Background(), currency.BTC, "")
+	_, err := g.GetDepositAddress(context.Background(), currency.BTC, "", "")
 	if err == nil {
 		t.Error("GetDepositAddress error cannot be nil")
 	}