geolocate: first pass of code review and minor fixes (#359)

* doc(geolocate): minor cleanup

* more minor cleanups of geolocate

* remove disabled test and see whether now it works

internal/engine/geolocate/geolocate_test.go

@@ -265,7 +265,7 @@ func TestLocationLookupSuccessWithResolverLookup(t *testing.T) {
 
 func TestSmoke(t *testing.T) {
 	config := Config{}
-	task := Must(NewTask(config))
+	task := NewTask(config)
 	result, err := task.Run(context.Background())
 	if err != nil {
 		t.Fatal(err)