samples/bpf: Remove the xdp_redirect* utilities

These utilities have all been ported to xdp-tools as functions of the
xdp-bench utility. The four different utilities in samples are incorporated
as separate subcommands to xdp-bench, with most of the command line
parameters left intact, except that mandatory arguments are always
positional in xdp-bench. For full usage details see the --help output of
each command, or the xdp-bench man page.

Some examples of how to convert usage to xdp-bench are:

xdp_redirect eth0 eth1
  --> xdp-bench redirect eth0 eth1

xdp_redirect_map eth0 eth1
  --> xdp-bench redirect-map eth0 eth1

xdp_redirect_map_multi eth0 eth1 eth2 eth3
  --> xdp-bench redirect-multi eth0 eth1 eth2 eth3

xdp_redirect_cpu -d eth0 -c 0 -c 1
  --> xdp-bench redirect-cpu -c 0 -c 1 eth0

xdp_redirect_cpu -d eth0 -c 0 -c 1 -r eth1
  --> xdp-bench redirect-cpu -c 0 -c 1 eth0 -r redirect -D eth1

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20230824102255.1561885-3-toke@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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