This update for libzypp, zypper fixes the following issues:

- Enhance XML output of repo GPG options
- Add optional attributes showing the raw values actually present in the '.repo' file.
- Link all executables with -PIE (bsc#1186447)
- Ship an empty '/etc/zypp/needreboot' per default (jsc#PM-2645)
- Add 'Solvable::isBlacklisted' as superset of retracted and ptf packages (bsc#1186503)
- Fix segv if 'ZYPP_FULLOG' is set.

This update was imported from the SUSE:SLE-15-SP2:Update update project.