Use code-generator to generate clientset/informer/lister (#1492)

To reduce maintenance effort and avoid writing duplicate informer code,
use code-generator to generate clientset/informer/lister code.

pkg/executor/reaper/reaper.go

@@ -205,7 +205,7 @@ func CleanupRoleBindings(logger *zap.Logger, client *kubernetes.Clientset, fissi
 
 			// in order to find out if there are any functions that need this role-binding in role-binding namespace,
 			// we can list the functions once per role-binding.
-			funcList, err := fissionClient.Functions(roleBinding.Namespace).List(meta_v1.ListOptions{})
+			funcList, err := fissionClient.V1().Functions(roleBinding.Namespace).List(meta_v1.ListOptions{})
 			if err != nil {
 				logger.Error("error fetching function list in namespace", zap.Error(err), zap.String("namespace", roleBinding.Namespace))
 				continue
@@ -252,7 +252,7 @@ func CleanupRoleBindings(logger *zap.Logger, client *kubernetes.Clientset, fissi
 				// else if its a secret-configmap-rb, we have only one SA which is fission-fetcher
 				if roleBinding.Name == types.PackageGetterRB {
 					// check if there is an env obj in saNs
-					envList, err := fissionClient.Environments(saNs).List(meta_v1.ListOptions{})
+					envList, err := fissionClient.V1().Environments(saNs).List(meta_v1.ListOptions{})
 					if err != nil {
 						logger.Error("error fetching environment list in service account namespace", zap.Error(err), zap.String("namespace", saNs))
 						continue