add apparmor to the Dockerfile

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)

Dockerfile

@@ -47,6 +47,7 @@ RUN	apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -yq \
 	ruby1.9.1 \
 	ruby1.9.1-dev \
 	s3cmd=1.1.0* \
+	apparmor \
 	--no-install-recommends
 
 # Get and compile LXC 0.8 (since it is the most stable)