Recommended update for yast2-packager

This update for yast2-packager fixes the following issue:

- Set the release version environment variable for zypp. (bsc#1172870, bsc#1173712)

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

Fixed bugs
bnc#1172870
$releasever expansion does not work during installation
bnc#1173712
$releasever in add_on_repositories.xml does not work
Selected Binaries
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