selftests/bpf: Incorporate LSM policy to token-based tests

Add tests for LSM interactions (both bpf_token_capable and bpf_token_cmd
LSM hooks) with BPF token in bpf() subsystem. Now child process passes
back token FD for parent to be able to do tests with token originating
in "wrong" userns. But we also create token in initns and check that
token LSMs don't accidentally reject BPF operations when capable()
checks pass without BPF token.

Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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