During dry run, "would create" iSCSI objects now populate id_map with
a source-ID placeholder so downstream objects (targets, target-extents)
can remap references without cascading failures.
Adds query_existing_iscsi() and clear_iscsi_config() to migrate.py, and
_prompt_clear_existing_iscsi() to the wizard: if the destination already
has iSCSI config, the user is shown a summary and offered Keep/Remove
before the dry run begins.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
scott
3fd9e6b6a8