shadow: Allow using bcrypt and yescrypt, and use yescrypt as the default

Yescrypt is the current default password hashing algorithm of Fedora
and Debian.  See [1] for its advantage.

Now we have libxcrypt providing the implementation of bcrypt and
yescrypt, we can switch to yescrypt as well.  We also don't need to
adjust the rounds for SHA512 anymore.

[1]:https://www.fedoraproject.org/wiki/Changes/yescrypt_as_default_hashing_method_for_shadow#Detailed_Description

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