Comment 1 for bug 1822251

This is an issue in devstack. You can see python-memcached is installed using python2.7:

http://logs.openstack.org/47/641747/8/check/neutron-grenade-dvr-multinode/f6fe13c/logs/old/devstacklog.txt#_2019-03-29_06_15_08_086

While keystone is installed with python3:

http://logs.openstack.org/47/641747/8/check/neutron-grenade-dvr-multinode/f6fe13c/logs/old/devstacklog.txt#_2019-03-29_06_15_13_680

For some reason the check to see whether it is compatible with python3 is failing:

http://logs.openstack.org/47/641747/8/check/neutron-grenade-dvr-multinode/f6fe13c/logs/old/devstacklog.txt#_2019-03-29_06_15_07_676

Even though the metadata is correct on pypi:

https://pypi.org/project/python-memcached/

The same problem is occurring for other packages too, so if it wasn't keystone it probably would have been something else:

http://logs.openstack.org/47/641747/8/check/neutron-grenade-dvr-multinode/f6fe13c/logs/old/devstacklog.txt#_2019-03-29_06_12_59_809