Updating dependency github.com/containerd/console to version v0.0.0-20180822173158-c12b1e7919c1

vendor/github.com/containerd/console/tc_unix.go

@@ -1,4 +1,20 @@
-// +build darwin freebsd linux solaris
+// +build darwin freebsd linux openbsd solaris
+
+/*
+   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 console