vendor containers/image v1.4

This requires some additional changes to the dependencies since the
progress-bar library has been changed to github.com/vbauerster/mpb.

Please refer to the following link for the release notes:
https://github.com/containers/image/releases/tag/v1.4

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/mattn/go-isatty/isatty_others.go

@@ -0,0 +1,10 @@
+// +build !windows
+// +build !appengine
+
+package isatty
+
+// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
+// terminal. This is also always false on this environment.
+func IsCygwinTerminal(fd uintptr) bool {
+	return false
+}