Istio integration (#421)

This the very first step for fission to integrate with Istio, which is an open platform to connect, manage, and secure microservices. With Istio, users are able to monitor functions usage and trace requests latency through dashboards. For more information, please visit http://fission.io/docs/

fission/environment.go

@@ -54,6 +54,7 @@ func envCreate(c *cli.Context) error {
 	envVersion := c.Int("version")
 	envBuilderImg := c.String("builder")
 	envBuildCmd := c.String("buildcmd")
+	envExternalNetwork := c.Bool("externalnetwork")
 
 	if len(envBuilderImg) > 0 {
 		envVersion = 2
@@ -84,8 +85,9 @@ func envCreate(c *cli.Context) error {
 				Image:   envBuilderImg,
 				Command: envBuildCmd,
 			},
-			Poolsize:  poolsize,
-			Resources: resourceReq,
+			Poolsize:                     poolsize,
+			Resources:                    resourceReq,
+			AllowAccessToExternalNetwork: envExternalNetwork,
 		},
 	}
 
@@ -130,6 +132,7 @@ func envUpdate(c *cli.Context) error {
 	envImg := c.String("image")
 	envBuilderImg := c.String("builder")
 	envBuildCmd := c.String("buildcmd")
+	envExternalNetwork := c.Bool("externalnetwork")
 
 	if len(envImg) == 0 && len(envBuilderImg) == 0 && len(envBuildCmd) == 0 {
 		fatal("Need --image to specify env image, or use --builder to specify env builder, or use --buildcmd to specify new build command.")
@@ -160,6 +163,8 @@ func envUpdate(c *cli.Context) error {
 		env.Spec.Poolsize = c.Int("poolsize")
 	}
 
+	env.Spec.AllowAccessToExternalNetwork = envExternalNetwork
+
 	_, err = client.EnvironmentUpdate(env)
 	checkErr(err, "update environment")