73b809b Use mountpoint command to check whether /boot is a mount point

Authored and Committed by javierm 5 years ago
    Use mountpoint command to check whether /boot is a mount point
    
    Using grep is wrong and fragile, so let's use the mountpoint command
    instead to make it more robust.
    
    Resolves: rhbz#1706091
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
    
        
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