bump containerd/zfs and dependencies

temporarily adds both pborman/uuid and google/uuid,
pending mistifyio/go-zfs#72

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/containerd/zfs/README.md

@@ -36,3 +36,13 @@ $ zfs create -o mountpoint=/var/lib/containerd/io.containerd.snapshotter.v1.zfs
 2. Start containerd.
 
 3. e.g. `ctr pull --snapshotter=zfs ...`
+
+## Project details
+
+The zfs plugin is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
+As a containerd sub-project, you will find the:
+ * [Project governance](https://github.com/containerd/project/blob/master/GOVERNANCE.md),
+ * [Maintainers](https://github.com/containerd/project/blob/master/MAINTAINERS),
+ * and [Contributing guidelines](https://github.com/containerd/project/blob/master/CONTRIBUTING.md)
+
+information in our [`containerd/project`](https://github.com/containerd/project) repository.

vendor/github.com/containerd/zfs/zfs.go

@@ -1,5 +1,21 @@
 // +build linux freebsd
 
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
 package zfs
 
 import (