Extract portforward to separate package (#728)

* Extract port-forward from CLI to own package (for reuseability)
* Extract CLI logging to subpackage

fission/watch.go

@@ -27,6 +27,7 @@ import (
 
 	"github.com/fission/fission"
 	"github.com/fission/fission/crd"
+	"github.com/fission/fission/fission/log"
 )
 
 func wCreate(c *cli.Context) error {
@@ -34,7 +35,7 @@ func wCreate(c *cli.Context) error {
 
 	fnName := c.String("function")
 	if len(fnName) == 0 {
-		fatal("Need a function name to create a watch, use --function")
+		log.Fatal("Need a function name to create a watch, use --function")
 	}
 	fnNamespace := c.String("fnNamespace")
 
@@ -95,13 +96,13 @@ func wCreate(c *cli.Context) error {
 
 func wGet(c *cli.Context) error {
 	// TODO
-	fatal("Not implemented")
+	log.Fatal("Not implemented")
 	return nil
 }
 
 func wUpdate(c *cli.Context) error {
 	// TODO
-	fatal("Not implemented")
+	log.Fatal("Not implemented")
 	return nil
 }
 
@@ -110,7 +111,7 @@ func wDelete(c *cli.Context) error {
 
 	wName := c.String("name")
 	if len(wName) == 0 {
-		fatal("Need name of watch to delete, use --name")
+		log.Fatal("Need name of watch to delete, use --name")
 	}
 	wNs := c.String("triggerns")