Iago Lopez Galeiras b1994387d3 core: use LSM BPF functions to implement RestrictFileSystems=
It attaches the LSM BPF program when the system manager starts up.

It populates the hash of maps BPF map when services that have
RestrictFileSystems= set start.

It cleans up the hash of maps when the unit cgroup is pruned.

To pass the file descriptor of the BPF map we add it to the keep_fds
array.
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Systemd

System and Service Manager

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