Fix go fmt errors in the build

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>

libnetwork/drivers/bridge/bridge_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/docker/libnetwork/driverapi"
 	"github.com/docker/libnetwork/iptables"
 	"github.com/docker/libnetwork/netlabel"
+	"github.com/docker/libnetwork/netutils"
 	"github.com/docker/libnetwork/osl"
 	"github.com/docker/libnetwork/types"
 	"github.com/vishvananda/netlink"

libnetwork/drivers/bridge/setup_ipv4_test.go

@@ -4,6 +4,7 @@ import (
 	"net"
 	"testing"
 
+	"github.com/docker/libnetwork/netutils"
 	"github.com/docker/libnetwork/osl"
 	"github.com/vishvananda/netlink"
 )