Recommended update for sles12sp3-docker-image, sles12sp4-image, system-user-root

This update for sles12sp3-docker-image, sles12sp4-image, system-user-root fixes the following issues:

- CVE-2019-5021: Include an invalidated root password by default, not an empty one (bsc#1134524)

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1134524
VUL-0: CVE-2019-5021: Containers have an empty password field for root in /etc/shadow
CVE-2019-5021
VUL-0: CVE-2019-5021: Containers have an empty password field for root in /etc/shadow
Selected Binaries
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