we even use that for basically all the related schema names, "groups"
allone is just rather not so telling, i.e., "groups" what?
While due to the additive nature of `group-filter` is not the best
possible name for passing multiple arguments on the CLI (the web-ui
can present this more UX-friendly anyway) due to possible confusion
about if the filter act like AND vs OR it can be documented and even
if a user is confused they still are safe on more being synced than
less. Also, the original param name wasn't really _that_ better in
that regards
Dietmar also suggested to use singular for the CLI option, while
there can be more they're passed over repeating the option, each with
a single filter.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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