added fetcher test cases (#2893)

* added fetcher test cases

* error message formatting fix

* error message formatting fix for e2e framework

cmd/fetcher/main.go

@@ -20,12 +20,15 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
 
 	"github.com/fission/fission/cmd/fetcher/app"
+	fv1 "github.com/fission/fission/pkg/apis/core/v1"
 	"github.com/fission/fission/pkg/crd"
 	"github.com/fission/fission/pkg/utils/loggerfactory"
 	"github.com/fission/fission/pkg/utils/manager"
 	"github.com/fission/fission/pkg/utils/profile"
 )
 
+const fetcherPort = "8000"
+
 // Usage: fetcher <shared volume path>
 func main() {
 
@@ -38,5 +41,5 @@ func main() {
 	ctx := signals.SetupSignalHandler()
 	profile.ProfileIfEnabled(ctx, logger, mgr)
 
-	app.Run(ctx, crd.NewClientGenerator(), logger, mgr)
+	app.Run(ctx, crd.NewClientGenerator(), logger, mgr, fetcherPort, fv1.PodInfoMount)
 }