*: appc/cni -> containernetworking/cni

The project has been moved so internally we simply rename everything.
Consumers are recommended to update their vendored version of cni.

plugins/ipam/dhcp/main.go

@@ -20,8 +20,8 @@ import (
 	"os"
 	"path/filepath"
 
-	"github.com/appc/cni/pkg/skel"
-	"github.com/appc/cni/pkg/types"
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
 )
 
 const socketPath = "/run/cni/dhcp.sock"