nova compute will call check_can_live_migrate_destination when doing
live migration and it will compare cpu model, however, following info
indicated that cpu compare is not supported at s390x arch.
URI qemu:///system does not support full set of host capabilities: this
function is not supported by the connection driver:
cannot compute baseline CPU of s390x architecture
https://www.libvirt.org/news.html has the info
v5.9.0 has Improvements part indicated the compare was added at 5.9
so the workaround is to avoid the check and let the migration proceed.
Change-Id: I253f4f305ecf8b5331212be87caef41f2ebb747e
Closes-Bug: 1854126
(cherry picked from commit 011cce6adb)
(cherry picked from commit 7d7a3ba70a)