selftests/bpf: Test bpf_link's get_next_id, get_fd_by_id, and get_obj_info
Extend bpf_obj_id selftest to verify bpf_link's observability APIs. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200429001614.1544-7-andriin@fb.com
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