bpf: split parse from program loading

bpf: split parse from program loading

Parsing command line is currently done together with potentially
loading a new eBPF program.  This makes it more difficult to
provide additional parameters for loading (which may come after
the eBPF program info on the command line).

Split the two (only internally for now).  Verbose parameter
has to be saved in struct bpf_cfg_in to be carried between
the stages.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>