pull-monitor: produce CRI pod & container configs
pull-monitor: produce CRI pod & container configs

CRI (well, at least crictl, the tool we plan to use to talk to CRI)
requires a particular format of JSON configuration file to describe
both pods and their constituent containers. Build these configuration
files.

Pass around the contents of the Pod configuration file to avoid
generating it twice. Make sure to clean up the temporary files used to
store them.

sipb/homeworld,sipb/homeworld,sipb/homeworld,sipb/homeworld