Recommended update for yast2

This update for yast2 fixes the following issues:

- Improve actions to stop and start a system service. (bsc#1162514)
- Avoid failure when downloading release notes from an inoperative proxy. (bsc#1173447)

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

Fixed bugs
bnc#1162514
iscsi session is not connected after successful connection via yast2 iscsi-client
bnc#1173447
SLES 15 SP2: inst_download_release_notes.rb failed with 'wrong argument type nil (expected Regexp)' (TypeError).
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