Security update for xen

This update for xen fixes the following issues:

- bsc#1174543 - secure boot related fixes
- bsc#1172356 - Not able to hot-plug NIC via virt-manager, asks to attach on next
reboot while it should be live attached

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1172356
Not able to hot-plug NIC via virt-manager, asks to attach on next reboot while it should be live attached
bnc#1174543
VUL-0: EMBARGOED: rerelease of secure boot related packages
Selected Binaries
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