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/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 (