The Software Update Stack was updated to receive fixes and enhancements.

libzypp:

Security issues fixed:
- CVE-2017-7435, CVE-2017-7436, CVE-2017-9269: Fix GPG check workflows, mainly for unsigned
repositories and packages. (bsc#1045735, bsc#1038984)

Bug fixes:
- Re-probe on refresh if the repository type changes. (bsc#1048315)
- Propagate proper error code to DownloadProgressReport. (bsc#1047785)
- Allow to trigger an appdata refresh unconditionally. (bsc#1009745)
- Support custom repo variables defined in /etc/zypp/vars.d.
- Adapt loop mounting of ISO images. (bsc#1038132, bsc#1033236)
- Fix potential crash if repository has no baseurl. (bsc#1043218)

zypper:

- Adapt download callback to report and handle unsigned packages. (bsc#1038984)
- Report missing/optional files as 'not found' rather than 'error'. (bsc#1047785)
- Document support for custom repository variables defined in /etc/zypp/vars.d.
- Emphasize that it depends on how fast PackageKit will respond to a 'quit' request sent
if PK blocks package management.

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