*: 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.

types/args_test.go

@@ -17,7 +17,7 @@ package types_test
 import (
 	"reflect"
 
-	. "github.com/appc/cni/pkg/types"
+	. "github.com/containernetworking/cni/pkg/types"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/ginkgo/extensions/table"