Enabling multi-tenancy for fission objects. (#655)

This feature allows creation of fission objects in different namespaces, in addition to retaining the existing behavior of creating fission objects in default namespace if user doesnt provide one. 
It also removes cluster admin roles for fission-fetcher and fission-builder Service Accounts and grants them only those privileges that they need.

fission/timetrigger.go

@@ -40,6 +40,8 @@ func ttCreate(c *cli.Context) error {
 	if len(fnName) == 0 {
 		fatal("Need a function name to create a trigger, use --function")
 	}
+	fnNamespace := c.String("fnNamespace")
+
 	cron := c.String("cron")
 	if len(cron) == 0 {
 		fatal("Need a cron spec like '0 30 * * *', '@every 1h30m', or '@hourly'; use --cron")
@@ -48,7 +50,7 @@ func ttCreate(c *cli.Context) error {
 	tt := &crd.TimeTrigger{
 		Metadata: metav1.ObjectMeta{
 			Name:      name,
-			Namespace: metav1.NamespaceDefault,
+			Namespace: fnNamespace,
 		},
 		Spec: fission.TimeTriggerSpec{
 			Cron: cron,
@@ -84,10 +86,11 @@ func ttUpdate(c *cli.Context) error {
 	if len(ttName) == 0 {
 		fatal("Need name of trigger, use --name")
 	}
+	ttNs := c.String("triggerns")
 
 	tt, err := client.TimeTriggerGet(&metav1.ObjectMeta{
 		Name:      ttName,
-		Namespace: metav1.NamespaceDefault,
+		Namespace: ttNs,
 	})
 	checkErr(err, "get time trigger")
 
@@ -97,6 +100,10 @@ func ttUpdate(c *cli.Context) error {
 		tt.Spec.Cron = newCron
 		updated = true
 	}
+
+	// TODO : During update, function has to be in the same ns as the trigger object
+	// but since we are not checking this for other triggers too, not sure if we need a check here.
+
 	fnName := c.String("function")
 	if len(fnName) > 0 {
 		tt.Spec.FunctionReference.Name = fnName
@@ -120,10 +127,11 @@ func ttDelete(c *cli.Context) error {
 	if len(ttName) == 0 {
 		fatal("Need name of trigger to delete, use --name")
 	}
+	ttNs := c.String("triggerns")
 
 	err := client.TimeTriggerDelete(&metav1.ObjectMeta{
 		Name:      ttName,
-		Namespace: metav1.NamespaceDefault,
+		Namespace: ttNs,
 	})
 	checkErr(err, "delete trigger")
 
@@ -133,8 +141,9 @@ func ttDelete(c *cli.Context) error {
 
 func ttList(c *cli.Context) error {
 	client := getClient(c.GlobalString("server"))
+	ttNs := c.String("triggerns")
 
-	tts, err := client.TimeTriggerList()
+	tts, err := client.TimeTriggerList(ttNs)
 	checkErr(err, "list Time triggers")
 
 	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)