Only set kernelopts in grubenv if it wasn't set before #41
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Users may want to use a different command line parameters, so if there's
a kernelopts var set in grubenv, grub2-mkconfig shouldn't reset it.
While being there, print a warning so users know that they shouldn't edit
the grub config file and instead edit the BootLoaderSpec config files.
Resolves: rhbz#1636466
Signed-off-by: Javier Martinez Canillas javierm@redhat.com