The package management stack was updated to fix some bugs.

Changes done in libsolv:
- add product:regflavor attribute [bnc#896224]

- fixes to build with swig 3.0.3

Changes done in libzypp:
- Properly propagate repo variables in service refresh.
- Let $ZYPP_REPO_RELEASEVER overwrite $releasever in .repo files
(bnc#911658)
- Call pool_set_rootdir to properly check for file conflicts.
- Use xgettext --boost to support boost-format (%N%)

- Parse and offer productRegisterFlavor attribute (bnc#896224)

- Improve conflict message for locked packages (bnc#828631)
- Fix broken de-escaping in str::splitEscaped (bnc#909772)
- cleanup loging

- CheckAccessDeleted: Filter PIDs running in a container (bnc#909143)

Changes done in zypper:
- New global option --releasever: Set the value of the $releasever
variable in all .repo files. This can be used to switch to new
distribution repositories when performing a distribution upgrade.
(bnc#911658)
- BuildRequires: libzypp-devel >= 14.34.0
- Clarify legacy warning (bnc#911335)

- info: show new product:registerflavor attribute (bnc#896224)

- Enhance 'Digest verification failed' message (FATE#315008)
- Enhance message text when skipping repos due to an error (bnc#909244)
- zypper.conf: fix wrong default mentioned in comment
- zypper-log(8): Update man page