CI: make it work again

Python changes:
- limit pip to 20.x as this is last version working on both Python 2 and 3.
- cap 'setuptools' to be older than 58 to have use_2to3 functionality
  (fixes 'anyjson' installation)
- upgrade pip in 'elasticsearch-curator' image to get it built on CentOS 7

Unbuildable images:
- 'bifrost-base' under CentOS 8
  (Error: Cannot find a valid baseurl for repo: epel)
- 'monasca-grafana' under CentOS 7/8
- 'sensu-client' under CentOS 7
  (aws-eventstream requires Ruby version >= 2.3)

- dropped *-upgrade CI jobs as Stein is EOL

- pin 'qpid-proton-c' package for CentOS 7 to not install EPEL one
  (cinder-volume, openstack-base and tripleoclient)

- bump 'libvirt-python' in 'masakari-monitors' to 7.10.0
  (newer branches install package from distribution but CentOS 7 lacks
  it)

- pin 'unf_ext' gem in Sensu images as CentOS 7 lacks Ruby 2.2+
  (fixed sensu-server)

- install 'ca-certificates' for newer Let's Encrypt certificates support
  (so we can fetch upper-constraints)

- make Zuul fetch openstack/requirements project files
   (make 'openstack-base' pass) (like 2nd fix)

Co-Authored-by: Pierre Riteau <pierre@stackhpc.com>
Closes-Bug: #1943617
Depends-On: https://review.opendev.org/c/openstack/kolla-ansible/+/826464

Change-Id: I8ee32e53cda581493b2a4bb73ca72ab05014b9d4

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