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aya/test/integration-ebpf
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Alessandro Decina 11c227743d bpf: improve bpf_probe_read_kernel_str_bytes and bpf_probe_read_user_str_bytes 
This change does a few things:

- it fixes a bug in the wrappers, where we were expecting the kernel to
  return len=1 for b"\0" where it instead returns 0 and doesn't write
  out the NULL terminator

- it makes the helpers more robust by hardcoding bound checks in
  assembly so that LLVM optimizations can't transform the checks in a
  way that the verifier can't understand.

- it adds integration tests
..
.cargo test: Replace RTF with Rust
src bpf: improve bpf_probe_read_kernel_str_bytes and bpf_probe_read_user_str_bytes
Cargo.toml bpf: improve bpf_probe_read_kernel_str_bytes and bpf_probe_read_user_str_bytes
rust-toolchain.toml test: Replace RTF with Rust
rustfmt.toml test: Replace RTF with Rust