Recommended update for yast2

This update for yast2 fixes the following issues:

- Stop "ls: write error: Broken pipe" messages. (bsc#1128032)
- Choose SuSEfirewall2 as default if no firewall has been installed. (bsc#1093052)
- Added more testcases if e.g. system is running in chroot environment
and systemd does not work properly (bsc#1113732)

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

Fixed bugs
bnc#1128032
yast2 network throws "ls: write error: Broken pipe"
bnc#1113732
yast services-manager in chroot environment: Internal error (we should detect and fail gracefully)
bnc#1093052
Yast Firewall reports: YaST cannot continue the configuration without installing the required packages, and exits
Selected Binaries
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