Install and configure in keystone

[Sandeep Rao]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [ ] This doc is inaccurate in this way: ______
- [x] This is a doc addition request.
- [x] I have a fix to the document that I can paste below including example: input and output.

For CentOS 8

yum install openstack-keystone httpd mod_wsgi - This should be replaced with

dnf install httpd python3-mod_wsgi openstack-keystone

If you have a troubleshooting or support issue, use the following resources:

 - Ask OpenStack: http://ask.openstack.org
 - The mailing list: http://lists.openstack.org
 - IRC: 'openstack' channel on Freenode

-----------------------------------
Release: on 2019-09-18 18:54:05
SHA: fb7d54543fd69e046a5136ca4028f4e128b947c2
Source: https://opendev.org/openstack/keystone/src/doc/source/install/keystone-install-rdo.rst
URL: https://docs.openstack.org/keystone/train/install/keystone-install-rdo.html