There are cases where systemd fails to restart kubernetes services.
This change fixes that by inceasing the restart interval in the
Use the heat-container-agent from a system container.
It means that the docker daemon can be started later.
Pass as a software deployment with the heat-agent the following
** pin prometheus to v1.8.2 since its config is not 2.0.0
Add heat-container-agent container image.
Implements: blueprint heat-agent