eeeca9c grub-set-bootflag: Write new env to tmpfile and then rename

Authored and Committed by javierm 4 years ago
    grub-set-bootflag: Write new env to tmpfile and then rename
    
    Resolves: CVE-2019-14865
    Resolves: rhbz#1776580
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
    
        
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