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Add selftests to exercise FD-based cgroup BPF program attachments and their intermixing with legacy cgroup BPF attachments. Auto-detachment and program replacement (both unconditional and cmpxchng-like) are tested as well. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200330030001.2312810-5-andriin@fb.com