genkeys, yggdrasilctl: Use pledge(2) on OpenBSD #1193
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Restrict system operations of CLI tools with https://man.openbsd.org/pledge.2.
https://pkg.go.dev/suah.dev/protect abstracts the OS specific code, i.e. is a NOOP on non-OpenBSD systems.
This PR is to gauge upstream interest in this direction; my OpenBSD port of yggdrasil already pledges the daemon,
resulting in minimal runtime privileges, but there are still a few rough edges:
https://github.com/jasperla/openbsd-wip/blob/master/net/yggdrasil/patches/patch-cmd_yggdrasil_main_go#L80