Fix link doesn't work sometimes when container start with multiple networks

If there is multiple networks to connect to on container starting,
the order of these networks is random because we "range a map". But
the defautl network "bridge" should be connected first since only
"bridge" support link and we should have do some settings on sandbox
creation, and only the first connect will setting the sandbox.

Signed-off-by: Lei Jitang <leijitang@huawei.com>

daemon/container_operations.go

@@ -397,7 +397,21 @@ func (daemon *Daemon) allocateNetwork(container *container.Container) error {
 		updateSettings = true
 	}
 
+	// always connect default network first since only default
+	// network mode support link and we need do some setting
+	// on sanbox initialize for link, but the sandbox only be initialized
+	// on first network connecting.
+	defaultNetName := runconfig.DefaultDaemonNetworkMode().NetworkName()
+	if nConf, ok := container.NetworkSettings.Networks[defaultNetName]; ok {
+		if err := daemon.connectToNetwork(container, defaultNetName, nConf, updateSettings); err != nil {
+			return err
+		}
+
+	}
 	for n, nConf := range container.NetworkSettings.Networks {
+		if n == defaultNetName {
+			continue
+		}
 		if err := daemon.connectToNetwork(container, n, nConf, updateSettings); err != nil {
 			return err
 		}