With su-exec, make sure the SIGTERM upon docker stop
could be received by the running program thus causing
a clean stop/exit.
Signed-off-by: Qi Zheng <qi.zheng@intel.com>
Use postgres instead of postgresql for the image name to align with the
Docker official library upstream.
Signed-off-by: George T Kramer <george.t.kramer@intel.com>