selftests/bpf: test device info reporting for bound progs

Check if bound programs report correct device info.  Test
in local namespace, in remote one, back to the local ns,
remove the device and check that information is cleared.

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