Previously, if we fail to start a storlet container using tenant
image, we retry to start it using default tenant image. However,
that sometimes causes unexpected retry, for example when there is
something wrong in tenant image which prevents daemon factory to
launch in time.
This patch makes docker runtime to check return code of container
restarting script, so that we only restart container when the
runtime fails in container operation using tenant image.
In addition, it lets docker runtime to log stdout/stderr output
generated by restart_docker_container, to help us to debug what
is happening about container management.
Change-Id: Icd81d28b9b3555bce365e7b279ada074d239fddc
25e7201203