tests: cleanup test directory

- add a `pkg` directory for packages
- add a `cases` directory for yml files

Signed-off-by: Dave Tucker <dt@docker.com>

test/pkg/poweroff/Dockerfile

@@ -0,0 +1,3 @@
+FROM alpine:3.5
+ADD . ./
+ENTRYPOINT ["/bin/sh", "/poweroff.sh"]

test/pkg/poweroff/Makefile

@@ -0,0 +1,29 @@
+.PHONY: tag push
+
+BASE=alpine:3.5
+IMAGE=poweroff
+
+default: push
+
+hash: Dockerfile poweroff.sh
+	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
+	tar cf - $^ | docker build --no-cache -t $(IMAGE):build -
+	docker run --rm --entrypoint=/bin/sh $(IMAGE):build -c "cat $^ /lib/apk/db/installed | sha1sum" | sed 's/ .*//' > hash
+
+push: hash
+	docker pull linuxkit/$(IMAGE):$(shell cat hash) || \
+		(docker tag $(IMAGE):build linuxkit/$(IMAGE):$(shell cat hash) && \
+		 docker push linuxkit/$(IMAGE):$(shell cat hash))
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+tag: hash
+	docker pull linuxkit/$(IMAGE):$(shell cat hash) || \
+		docker tag $(IMAGE):build linuxkit/$(IMAGE):$(shell cat hash)
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+clean:
+	rm -f hash
+
+.DELETE_ON_ERROR:

test/pkg/poweroff/poweroff.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+TIMEOUT=${1:-30}  
+sleep "${TIMEOUT}"
+
+/sbin/poweroff -f