Errors when installing OpenStack Newton on CentOS7 with packstack

While establishing a new OpenStack Newton installation on CentOS7 using packstack, I encountered the following error after running packstack --allinone (doing a multi-node install made no difference, though)


This is a companion discussion topic for the original entry at https://www.funkypenguin.co.nz/note/keystone-errors-on-openstack-newton-on-centos7/