this fixes hairpin nat tryinng to ping a the host and port from inside a container

Signed-off-by: Jessica Frazelle <princess@docker.com>

daemon/networkdriver/bridge/driver.go

@@ -124,7 +124,7 @@ func InitDriver(config *Config) error {
 
 	// try to modprobe bridge first
 	// see gh#12177
-	if out, err := exec.Command("modprobe", "-va", "bridge", "nf_nat").Output(); err != nil {
+	if out, err := exec.Command("modprobe", "-va", "bridge", "nf_nat", "br_netfilter").Output(); err != nil {
 		logrus.Warnf("Running modprobe bridge nf_nat failed with message: %s, error: %v", out, err)
 	}