Added quick test for upgrade container

Dockerfile

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+FROM alpine:3.6
+MAINTAINER FrenchBen <FrenchBen@docker.com>
+COPY latest /src/
+WORKDIR /infrakit
+VOLUME ["/infrakit"]
+
+CMD ["cp", "-R", "/src/*", "/infrakit"]

Makefile

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+TAG := 0.5
+NAMESPACE := infrakit
+UPGRADE_IMAGE := ${NAMESPACE}/upgrade:${TAG}
+
+build:
+	docker image build -t infrakit-test -f test/Dockerfile .
+	docker image build -t ${UPGRADE_IMAGE} -f Dockerfile .
+
+test: clean build
+	docker volume create infrakit 
+	docker container run -d -t --name infrakit-test -v infrakit:/infrakit infrakit-test
+	docker container run -d --name infrakit-upgrade -v infrakit:/infrakit ${UPGRADE_IMAGE} sh -c "sleep 10 && cp -R /src/* /infrakit"
+	docker exec -t infrakit-test watch -d cat /infrakit/swarm/infrakit.sh
+
+clean:
+	-docker container rm -f infrakit-test
+	-docker container rm -f infrakit-upgrade
+	-docker volume rm infrakit

test/Dockerfile

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+FROM alpine:3.6
+MAINTAINER FrenchBen <FrenchBen@docker.com>
+RUN apk add --update --no-cache tini
+
+COPY latest /infratest
+COPY test/entry.sh /entry.sh
+RUN chmod +x /entry.sh
+ENTRYPOINT ["/sbin/tini", "--", "/entry.sh"]
+
+CMD ["top"]

test/entry.sh

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+#!/bin/sh
+set -e
+mv /infratest/* /infrakit/
+sed -i 's/docker run/docker container run/' /infrakit/swarm/infrakit.sh
+
+eval "$@"