CI jobs failing Sept 11 due to "ERROR: No matching distribution found for configparser===4.0.1"

https://zuul.opendev.org/t/openstack/build/1869649b43194e2e9e8802cf87c72b34/log/job-output.txt#948

2019-09-12 01:08:49.354895 | ubuntu-bionic | ERROR: No matching distribution found for configparser===4.0.1 (from -c /home/zuul/src/opendev.org/openstack/requirements/upper-constraints.txt (line 620))

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22ERROR%3A%20No%20matching%20distribution%20found%20for%20configparser%3D%3D%3D4.0.1%5C%22%20AND%20tags%3A%5C%22console%5C%22&from=7d

357 hits in 48 hours, check and gate, all failures. Looks like it's fixed so we can use this for tracking it out of elastic-recheck.