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>

test/e2e/framework/cli/cli.go

@@ -0,0 +1,27 @@
+package cli
+
+import (
+	"bytes"
+	"context"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"github.com/fission/fission/cmd/fission-cli/app"
+	"github.com/fission/fission/pkg/fission-cli/cmd"
+	"github.com/fission/fission/test/e2e/framework"
+)
+
+func ExecCommand(f *framework.Framework, ctx context.Context, args ...string) (string, error) {
+	cmd := app.App(cmd.ClientOptions{
+		RestConfig: f.RestConfig(),
+		Namespace:  metav1.NamespaceDefault,
+	})
+	cmd.SilenceErrors = true // use our own error message printer
+	cmd.SetArgs(args)
+	buf := new(bytes.Buffer)
+	cmd.SetOut(buf)
+	cmd.SetErr(buf)
+
+	err := cmd.ExecuteContext(ctx)
+	return buf.String(), err
+}