Envtest based integration tests for Fission (#2858)

* skeleton for envtest fission
* Refactor code and add CLI test
* hack
* Update server test
* remove skip-ci for lint tests
* Pass client go storagesvc
* Add clientGen interface across code
* Fix storagesvc test
* Fix cmd client
* add retry in server test
* Fix concurrenct access to pool deployment
* Remove old executor test
* get rid of ginkgo/gomega
* disable flaky test
* flaky test
* revert ci change
* handle err from ParseBool

---------

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>
Co-authored-by: Pranoy Kundu <pranoy1998k@gmail.com>

pkg/fission-cli/util/portforward.go

@@ -48,10 +48,11 @@ func SetupPortForward(ctx context.Context, client cmd.Client, namespace, labelSe
 	console.Verbose(2, "Setting up port forward to %s in namespace %s",
 		labelSelector, namespace)
 
-	localPort, err := findFreePort()
+	lcPort, err := utils.FindFreePort()
 	if err != nil {
 		return "", errors.Wrap(err, "error finding unused port")
 	}
+	localPort := strconv.Itoa(lcPort)
 
 	var waitDuration time.Duration = 50
 
@@ -103,22 +104,6 @@ func SetupPortForward(ctx context.Context, client cmd.Client, namespace, labelSe
 	return localPort, nil
 }
 
-func findFreePort() (string, error) {
-	listener, err := net.Listen("tcp", ":0")
-	if err != nil {
-		return "", err
-	}
-
-	port := strconv.Itoa(listener.Addr().(*net.TCPAddr).Port)
-
-	err = listener.Close()
-	if err != nil {
-		return "", err
-	}
-
-	return port, nil
-}
-
 // runPortForward creates a local port forward to the specified pod
 func runPortForward(ctx context.Context, client cmd.Client, labelSelector string, localPort string, ns string) (chan struct{}, chan struct{}, error) {