Moved the TOML based Configuration to dnet

The configuration format for docker runtime is based on daemon flags and
hence adjusting the libnetwork configuration to accomodate it by moving
the TOML based configuration to the dnet tool.

Also changed the controller configuration via options

Signed-off-by: Madhu Venugopal <madhu@docker.com>

cmd/test/main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"net"
-	"os"
 	"time"
 
 	log "github.com/Sirupsen/logrus"
@@ -14,8 +13,7 @@ import (
 
 func main() {
 	log.SetLevel(log.DebugLevel)
-	os.Setenv("LIBNETWORK_CFG", "libnetwork.toml")
-	controller, err := libnetwork.New("libnetwork.toml")
+	controller, err := libnetwork.New()
 	if err != nil {
 		log.Fatal(err)
 	}