shadow-maint/shadow 4.19.1

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shadow-4.19.1

Regression fixes:

• chpasswd(8):
  • Don't reject leading '!' in password hashes or a hash consisting
    of "*". These were accidentally rejected in 4.19.0.
    See #1483
    and #1486.
  • Don't reject a passwordless account ("" or "!").
    See #1483 (comment)
    and #1505.