openEuler 20.03-LTS-SP2 was out of date in May 2022. 22.03 LTS
is the newest LTS version. It was release in March 2022 and
will be maintained for 2 years. This patch upgrades the LTS
version. It'll be used in Devstack, Kolla-ansible and so on
in CI jobs.
This patch also enables the YUM mirror to speed up the package
download.
Change-Id: Iba38570d96374226b924db3aca305f7571643823
