Add a new type to use for building filter predicates for API requests,
replacing "./api/types/filters".Args in the client. Remove the now
unused api/types/filters package.
Signed-off-by: Cory Snider <csnider@mirantis.com>
This field was deprecated in [moby@cfcbfab] when this struct still lived
in the API. The field is no longer used, and we don't have to carry it
forward as part of the new client module.
[moby@cfcbfab]: cfcbfabb0f
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
