Install and configure in keystone

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:

- [X] This doc is inaccurate in this way: The order of installation matters. Your install guide shows "apt install keystone apache2 libapache2-mod-wsgi." The order needs to have keystone last because libapache2-mod-wsgi will revert setting pushed by keystone package.

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

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Release: on 2018-12-10 15:55:13
SHA: 5e45743d52ddcc9503aebda373948347587a01b1
Source: https://git.openstack.org/cgit/openstack/keystone/tree/doc/source/install/keystone-install-ubuntu.rst
URL: https://docs.openstack.org/keystone/stein/install/keystone-install-ubuntu.html