exchanges: shift GetDefaultConfig wrapper function to exchange.go (#1472)

* Shift wrapper function GetDefaultConfig to exchange.Base method definition, to ensure set defaults doesn't get called twice and to reduce code

* rm alphapoint bootstrap method as is defined as exchange.Base method

* add tests

* glorious: make it a function and make it IBOTEXCHANGE

---------

Co-authored-by: shazbert <ryan.oharareid@thrasher.io>

exchanges/exchange.go

@@ -1943,3 +1943,35 @@ func (b *Base) Bootstrap(_ context.Context) (continueBootstrap bool, err error)
 func (b *Base) IsVerbose() bool {
 	return b.Verbose
 }
+
+// GetDefaultConfig returns a default exchange config
+func GetDefaultConfig(ctx context.Context, exch IBotExchange) (*config.Exchange, error) {
+	if exch == nil {
+		return nil, errExchangeIsNil
+	}
+
+	if exch.GetName() == "" {
+		exch.SetDefaults()
+	}
+
+	b := exch.GetBase()
+
+	exchCfg, err := b.GetStandardConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	err = b.SetupDefaults(exchCfg)
+	if err != nil {
+		return nil, err
+	}
+
+	if b.Features.Supports.RESTCapabilities.AutoPairUpdates {
+		err = exch.UpdateTradablePairs(ctx, true)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return exchCfg, nil
+}