Groupby parameters not passed correctly from CLI

[bosd]

When invoking an import from the CLI with the groupby parameter the arguments are not correctly passed along.
eg

odoo-data-flow --verbose import \
    --connection-file conf/local_connection.conf \
    --file /home/bosd/doodba/data/res_partner_bank.csv \
    --model res.partner.bank \
    --encoding utf-8 \
    --worker 1 \
    --size 500 \
    --sep ';' \
    --groupby partner_id/id \
    --context '{"tracking_disable": True, "defer_fields_computation": True, "mail_create_nosubscribe": True}'

Results in an error message:

sh res_partner_bank_local.sh
[11:23:49] INFO     Starting data import process from file...                                                                                                                                                                                       importer.py:111
           INFO     Running pre-flight check: Verifying Odoo connection...                                                                                                                                                                          preflight.py:93
           INFO     Connecting to Odoo server at localhost...                                                                                                                                                                                        conf_lib.py:40
           INFO     Connection to Odoo successful.                                                                                                                                                                                                  preflight.py:99
           INFO     Running pre-flight check: Detecting self-referencing hierarchy...                                                                                                                                                              preflight.py:121
           INFO     No self-referencing hierarchy detected.                                                                                                                                                                                        preflight.py:145
           DEBUG    Skipping language pre-flight check.                                                                                                                                                                                            preflight.py:251
           INFO     Running pre-flight check: Verifying fields for model 'res.partner.bank'...                                                                                                                                                     preflight.py:467
           INFO     Loading fields_get cache for model 'res.partner.bank' from cache.                                                                                                                                                                  cache.py:131
╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────── ReadOnly Fields Detected ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ The following readonly fields will be silently ignored during import:                                                                                                                                                                                           │
│   - 'id' (stored readonly integer)                                                                                                                                                                                                                              │
│   - 'company_id/id' (stored readonly many2one)                                                                                                                                                                                                                  │
│                                                                                                                                                                                                                                                                 │
│ Values for these fields will be silently discarded during import.                                                                                                                                                                                               │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
           INFO     Pre-flight Check Successful: All columns are valid fields on the model.                                                                                                                                                        preflight.py:499
           DEBUG    Reusing cached connection for conf/local_connection.conf                                                                                                                                                                         conf_lib.py:66
           DEBUG    Initialized RPC thread pool with requested 1 connections, effectively using 1 to prevent connection pool exhaustion                                                                                                            rpc_thread.py:40
           ERROR    Grouping column 'p' not found. Cannot use --groupby.                                                                                                                                                                     import_threaded.py:245
     Pass 1/2: Importing to res.partner.bank                         

the partner_id/id seems to be internally split as ["p","a","r"....]
Expected Behaviour: it should be treated as one string. partner_id/id
And it should still be possible to pass multiple clumns for the groupby feature separated by a comma.

[google-labs-jules]

Jules is on it. When finished, you will see another comment and be able to review a PR.

[google-labs-jules]

Ready for a review! A PR has been created.