[BUGFIX] Catch subprocess.CalledProcessError
[BUGFIX] Catch subprocess.CalledProcessError

For the `docker ps | grep zk_ambassador` command in the
`docker_python_helpers/run_storm_supervisor.py` script.

Signed-off-by: Pang Yan Han <22594c345857f664c61cd411f607c4d40a9d4af9@gmail.com>

viki-org/storm-docker,viki-org/storm-docker