pkg,plugins: update for Result struct Interface index changes

It's a pointer now, so we need to use the helper function to set
the field and also test for nil before accessing it.

plugins/main/bridge/bridge.go

@@ -100,7 +100,7 @@ func calcGateways(result *current.Result, n *NetConf) (*gwInfo, *gwInfo, error)
 		defaultNet.Mask = net.IPMask(defaultNet.IP)
 
 		// All IPs currently refer to the container interface
-		ipc.Interface = 2
+		ipc.Interface = current.Int(2)
 
 		// If not provided, calculate the gateway address corresponding
 		// to the selected IP address

plugins/main/ipvlan/ipvlan.go

@@ -159,7 +159,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	}
 	for _, ipc := range result.IPs {
 		// All addresses belong to the ipvlan interface
-		ipc.Interface = 0
+		ipc.Interface = current.Int(0)
 	}
 
 	result.Interfaces = []*current.Interface{ipvlanInterface}

plugins/main/macvlan/macvlan.go

@@ -179,7 +179,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 	for _, ipc := range result.IPs {
 		// All addresses apply to the container macvlan interface
-		ipc.Interface = 0
+		ipc.Interface = current.Int(0)
 	}
 
 	err = netns.Do(func(_ ns.NetNS) error {

plugins/main/ptp/ptp.go

@@ -75,7 +75,7 @@ func setupContainerVeth(netns ns.NetNS, ifName string, mtu int, pr *current.Resu
 
 		for _, ipc := range pr.IPs {
 			// All addresses apply to the container veth interface
-			ipc.Interface = 1
+			ipc.Interface = current.Int(1)
 		}
 
 		pr.Interfaces = []*current.Interface{hostInterface, containerInterface}

plugins/main/vlan/vlan.go

@@ -148,7 +148,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	}
 	for _, ipc := range result.IPs {
 		// All addresses belong to the vlan interface
-		ipc.Interface = 0
+		ipc.Interface = current.Int(0)
 	}
 
 	result.Interfaces = []*current.Interface{vlanInterface}