This update for libzypp, zypper provides the following fixes:

Changes in libzypp:
- VendorAttr: Const-correct API and let Target provide its settings. (bsc#1174918)
- Support buildnr with commit hash in purge-kernels. This adds special behaviour for when
a kernel version has the rebuild counter before the kernel commit hash. (bsc#1175342)
- Improve Italian translation of the "breaking dependencies" message. (bsc#1173529)
- Make sure reading from lsof does not block forever. (bsc#1174240)
- Just collect details for the signatures found.

Changes in zypper:
- man: Enhance description of the global package cache. (bsc#1175592)
- man: Point out that plain rpm packages are not downloaded to the global package cache.
(bsc#1173273)
- Directly list subcommands in 'zypper help'. (bsc#1165424)
- Remove extern C block wrapping augeas.h as it breaks the build on Arch Linux.
- Point out that plaindir repos do not follow symlinks. (bsc#1174561)
- Fix help command for list-patches.

This update was imported from the SUSE:SLE-15-SP1:Update update project.