Migrate to containerd v1.7.0 and update dependencies

* Updates containerd to v1.7.0 and new binary for 32-bit
Arm OSes.
* Updates Go dependencies - openfaas and external

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/github.com/cyphar/filepath-securejoin/vfs.go

@@ -0,0 +1,41 @@
+// Copyright (C) 2017 SUSE LLC. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package securejoin
+
+import "os"
+
+// In future this should be moved into a separate package, because now there
+// are several projects (umoci and go-mtree) that are using this sort of
+// interface.
+
+// VFS is the minimal interface necessary to use SecureJoinVFS. A nil VFS is
+// equivalent to using the standard os.* family of functions. This is mainly
+// used for the purposes of mock testing, but also can be used to otherwise use
+// SecureJoin with VFS-like system.
+type VFS interface {
+	// Lstat returns a FileInfo describing the named file. If the file is a
+	// symbolic link, the returned FileInfo describes the symbolic link. Lstat
+	// makes no attempt to follow the link. These semantics are identical to
+	// os.Lstat.
+	Lstat(name string) (os.FileInfo, error)
+
+	// Readlink returns the destination of the named symbolic link. These
+	// semantics are identical to os.Readlink.
+	Readlink(name string) (string, error)
+}
+
+// osVFS is the "nil" VFS, in that it just passes everything through to the os
+// module.
+type osVFS struct{}
+
+// Lstat returns a FileInfo describing the named file. If the file is a
+// symbolic link, the returned FileInfo describes the symbolic link. Lstat
+// makes no attempt to follow the link. These semantics are identical to
+// os.Lstat.
+func (o osVFS) Lstat(name string) (os.FileInfo, error) { return os.Lstat(name) }
+
+// Readlink returns the destination of the named symbolic link. These
+// semantics are identical to os.Readlink.
+func (o osVFS) Readlink(name string) (string, error) { return os.Readlink(name) }