user-util: add generic definition for special password hash values in /etc/passwd + /etc/shadow
Let's add three defines for the 3 special cases of passwords. Some of our tools used different values for the "locked"/"invalid" case, let's settle on using "!*" which means the password is both locked *and* invalid. Other tools like to use "!!" for this case, which however is less than ideal I think, since the this could also be a considered an entry with an empty password, that can be enabled again by unlocking it twice.
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