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>

exchanges/itbit/itbit_test.go

@@ -56,12 +56,12 @@ func TestMain(m *testing.M) {
 
 func TestStart(t *testing.T) {
 	t.Parallel()
-	err := i.Start(nil)
+	err := i.Start(context.Background(), nil)
 	if !errors.Is(err, common.ErrNilPointer) {
 		t.Fatalf("received: '%v' but expected: '%v'", err, common.ErrNilPointer)
 	}
 	var testWg sync.WaitGroup
-	err = i.Start(&testWg)
+	err = i.Start(context.Background(), &testWg)
 	if err != nil {
 		t.Fatal(err)
 	}