Tweak test-docker-py feature

- move docker/docker-py clone to the Dockerfile
- put "integration test daemon startup" code in a separate file for both scripts to source
- add new test-docker-py Makefile target
- include "python-websocket" package in Dockerfile for running the tests

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>

Dockerfile

@@ -44,6 +44,7 @@ RUN	apt-get update && apt-get install -y \
 	parallel \
 	python-mock \
 	python-pip \
+	python-websocket \
 	reprepro \
 	ruby1.9.1 \
 	ruby1.9.1-dev \
@@ -95,6 +96,9 @@ RUN	git clone -b buildroot-2014.02 https://github.com/jpetazzo/docker-busybox.gi
 # Get the "cirros" image source so we can import it instead of fetching it during tests
 RUN	curl -sSL -o /cirros.tar.gz https://github.com/ewindisch/docker-cirros/raw/1cded459668e8b9dbf4ef976c94c05add9bbd8e9/cirros-0.3.0-x86_64-lxc.tar.gz
 
+# Get the "docker-py" source so we can run their integration tests
+RUN	git clone -b 0.7.0 https://github.com/docker/docker-py.git /docker-py
+
 # Setup s3cmd config
 RUN	/bin/echo -e '[default]\naccess_key=$AWS_ACCESS_KEY\nsecret_key=$AWS_SECRET_KEY' > $HOME/.s3cfg