MKPasswd idempotency patch

[grub-devel]

Hello,

I want to use grub-mkpasswd inside of a ansible playbook, therefore a 
idempotency or check feature is required.
Without it, there is no posibility to verify, that the configuration is already 
inplace.
Therefore I want to suggest implementing the attached changes.
The simplest one I was thinking of, is grub-mkpasswd allowing to specify a salt 
and comparing the results.
My patch also introduces a quiet mode, that basically suppresses all prompts 
and only expects the password to be entered/piped in once. It also changes the 
output slightly to not inlcude the `PBKDF2 hash of your password is `-part.

The patch is attached to this mail.

Best,
Klaus Frank

0001-Implement-salt-value-and-quiet-parameter-for-grub-mk.patch
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