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Correctly open mountinfo with sandbox=none

Hanna Czenczek requested to merge hreitz/virtiofsd-rs:fix-handles-for-no-sandbox into main

We need to open /proc/self/mountinfo with O_RDONLY, because we want to read from it. Instead, we open it with O_PATH (when using sandbox=none), though, which is wrong and will later prevent us from creating openable file handles.

Fix it.

(Reported by German)

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