bpf: Small BPF verifier log improvements

In particular these include:

  1) Remove output of inv for scalars in print_verifier_state
  2) Replace inv with scalar in verifier error messages
  3) Remove _value suffixes for umin/umax/s32_min/etc (except map_value)
  4) Remove output of id=0
  5) Remove output of ref_obj_id=0

Signed-off-by: Mykola Lysenko <mykolal@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220301222745.1667206-1-mykolal@fb.com