This update for shadow fixes several issues.

This security issue was fixed:

- CVE-2017-12424: The newusers tool could have been forced to manipulate
internal data structures in ways unintended by the authors. Malformed input may
have lead to crashes (with a buffer overflow or other memory corruption) or
other unspecified behaviors (bsc#1052261).

These non-security issues were fixed:

- bsc#1023895: Fixed man page to not contain invalid options and also prevent
warnings when using these options in certain settings
- bsc#980486: Reset user in /var/log/tallylog because of the usage of pam_tally2

This update was imported from the SUSE:SLE-12-SP2:Update update project.