dpodctl - deduce pod name from directory name
dpodctl - deduce pod name from directory name

This eliminates PodName directive. Unless overridden with -P option, the pod name is the the name of the directory holding the config. This way just by looking at the directory structure the user of the tool knows the name of all relevant containers.

This also made ImageName optional as the pod name can serve as the default name for the image.

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