Automatically clean up hello-world container with --rm

Signed-off-by: Bruno Binet <bruno.binet@gmail.com>

hack/install.sh

@@ -85,7 +85,7 @@ case "$lsb_dist" in
 		if command_exists docker && [ -e /var/run/docker.sock ]; then
 			(
 				set -x
-				$sh_c 'docker run hello-world'
+				$sh_c 'docker run --rm hello-world'
 			) || true
 		fi
 		your_user=your-user
@@ -162,7 +162,7 @@ case "$lsb_dist" in
 		if command_exists docker && [ -e /var/run/docker.sock ]; then
 			(
 				set -x
-				$sh_c 'docker run hello-world'
+				$sh_c 'docker run --rm hello-world'
 			) || true
 		fi
 		your_user=your-user