aktualizr-info: Fix naming of Image repo and Targets metadata.
aktualizr-info: Fix naming of Image repo and Targets metadata.

This has bugged for me so long. The old options are still supported but
are hidden from the --help output.

Signed-off-by: Patrick Vacek <a38520cbbe2e974bc8b7ea86877dd3c7115ca2d7@gmail.com>

advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr