This update for xen fixes the following issues:

- Booting Fedora31 VM on SLES-15-SP1 Xen Domain 0. (bsc#1162040)
This solve a Grub2ConfigFile issue with a wrong handling of next and saved entries.
- Update to Xen 4.12.2 including upstream fixes (bsc#1027519)
This update will also clear stubs.addr and stubs.mfn in order to allocate a new stub page
when needed, whether the CPU gets parked or removed.
Event channels are the basic primitive provided by Xen for event notifications.
This fix will also improve the event channel handling.

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