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/mqtrigger.go

@@ -40,6 +40,7 @@ func mqtCreate(c *cli.Context) error {
 	if len(fnName) == 0 {
 		fatal("Need a function name to create a trigger, use --function")
 	}
+	fnNamespace := c.String("fnNamespace")
 
 	var mqType fission.MessageQueueType
 	switch c.String("mqtype") {
@@ -76,7 +77,7 @@ func mqtCreate(c *cli.Context) error {
 	mqt := &crd.MessageQueueTrigger{
 		Metadata: metav1.ObjectMeta{
 			Name:      mqtName,
-			Namespace: metav1.NamespaceDefault,
+			Namespace: fnNamespace,
 		},
 		Spec: fission.MessageQueueTriggerSpec{
 			FunctionReference: fission.FunctionReference{
@@ -115,6 +116,8 @@ func mqtUpdate(c *cli.Context) error {
 	if len(mqtName) == 0 {
 		fatal("Need name of trigger, use --name")
 	}
+	mqtNs := c.String("triggerns")
+
 	topic := c.String("topic")
 	respTopic := c.String("resptopic")
 	fnName := c.String("function")
@@ -122,10 +125,12 @@ func mqtUpdate(c *cli.Context) error {
 
 	mqt, err := client.MessageQueueTriggerGet(&metav1.ObjectMeta{
 		Name:      mqtName,
-		Namespace: metav1.NamespaceDefault,
+		Namespace: mqtNs,
 	})
 	checkErr(err, "get Time trigger")
 
+	// TODO : Find out if we can make a call to checkIfFunctionExists, in the same ns more importantly.
+
 	checkMQTopicAvailability(mqt.Spec.MessageQueueType, topic, respTopic)
 
 	updated := false
@@ -163,10 +168,11 @@ func mqtDelete(c *cli.Context) error {
 	if len(mqtName) == 0 {
 		fatal("Need name of trigger to delete, use --name")
 	}
+	mqtNs := c.String("triggerns")
 
 	err := client.MessageQueueTriggerDelete(&metav1.ObjectMeta{
 		Name:      mqtName,
-		Namespace: metav1.NamespaceDefault,
+		Namespace: mqtNs,
 	})
 	checkErr(err, "delete trigger")
 
@@ -176,8 +182,9 @@ func mqtDelete(c *cli.Context) error {
 
 func mqtList(c *cli.Context) error {
 	client := getClient(c.GlobalString("server"))
+	mqtNs := c.String("triggerns")
 
-	mqts, err := client.MessageQueueTriggerList(c.String("mqtype"))
+	mqts, err := client.MessageQueueTriggerList(c.String("mqtype"), mqtNs)
 	checkErr(err, "list message queue triggers")
 
 	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)