For missing required parameters adds error return before attempting any
actions to `ctr images` commands.
Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
- Use lease API (previoisly, GC was not supported)
- Refactored interfaces for ease of future Docker v1 importer support
For usage, please refer to `ctr images import --help`.
Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
