Previously, `object head` was used if no range was provided.
This is wrong on multiple levels:
1. We print an error if the checksum is missing in header,
even though taking hash is possible.
2. We silently ignore --salt parameter.
3. `--range` is required for Object.RANGEHASH RPC, custom logic for one
specific usecase has no value.
So we make it required and make CLI command follow more closely
the FrostFS API.
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
