When vmspawn executes ssh-keygen it currently hides all std{out,err}.
This is not ideal when errors happen, so this commit tweaks the
code to include stderr in the output.
My use case is that I recently ran into the issue that inside a
`mkosi box` my systemd-homed user was not available so ssh-keygen
errored with `No user exists for uid 1000` [0] but that error was
not visible, only the generic:
`'/usr/bin/ssh-keygen' failed with exit status 255.`
was displayed.
This also adds FORK_REOPEN_LOG to the pidref_safe_fork flags,
thanks to Mike Yuan for the suggestion.
[0] Arguably this is also an issue in ssh-keygen because it does
not need to do the user lookup when `-f /path/` is passed.
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