network-bridge: Fix for bonding

If ${netdev} is bonding, brctl addif ${bridge} ${pdev} fails:
  can't add ${pdev} to bridge ${bridge}: Invalid argument
Because ${pdev} has no slaves at this point.=20
# Notice that ifdown ${netdev} clears slaves of ${netdev}.

This patch restores slaves before add_to_bridge2 ${bridge} ${pdev}.

Signed-off-by: KUWAMURA Shin'ya <kuwa@jp.fujitsu.com>

tools/hotplug/Linux/network-bridge

@@ -223,6 +223,10 @@ op_start () {
 
     preiftransfer ${netdev}
     transfer_addrs ${netdev} ${tdev}
+    # Remember slaves for bonding interface.
+    if [ -e /sys/class/net/${netdev}/bonding/slaves ]; then
+	slaves=`cat /sys/class/net/${netdev}/bonding/slaves`
+    fi
     # Remember the IP details for do_ifup.
     get_ip_info ${netdev}
     if ! ifdown ${netdev}; then
@@ -234,6 +238,11 @@ op_start () {
 
     setup_bridge_port ${pdev}
 
+    # Restore slaves
+    if [ -n "${slaves}" ]; then
+	ip link set ${pdev} up
+	ifenslave ${pdev} ${slaves}
+    fi
     add_to_bridge2 ${bridge} ${pdev}
     do_ifup ${bridge}