This makes the need to pull $(BASE) redundant.
Rebuild resulted in linuxkit/guestfs:aecc40bf84ce4f4238e06934c46d7cc570a39eed@sha256:62e810869e83dabe04af7ac8fcd81d9f177d986a3424dcb9c4eb5439993c962f
Signed-off-by: Ian Campbell <ijc@docker.com>
Guestfs is not really a base package and is only used
byt other images in the ./tools directory. Move it there.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>