cmd/wrapper_coverage: prevent non-needed REST requests via context timeout (#1154)

* wrapper_coverage/exchanges: cancel context to not send rest requests/ populate context through functions that do rest requests

* linter: fix

* exchange_template: fix test

---------

Co-authored-by: Ryan O'Hara-Reid <ryan.oharareid@thrasher.io>

engine/engine.go

@@ -888,11 +888,11 @@ func (bot *Engine) LoadExchange(name string, wg *sync.WaitGroup) error {
 	}
 
 	if wg != nil {
-		return exch.Start(wg)
+		return exch.Start(context.TODO(), wg)
 	}
 
 	tempWG := sync.WaitGroup{}
-	err = exch.Start(&tempWG)
+	err = exch.Start(context.TODO(), &tempWG)
 	if err != nil {
 		return err
 	}