Install and configure (Red Hat) in glance

[Jiang]

The doc https://docs.openstack.org/glance/pike/install/install-rdo.html just only mentions the login mysql database, but did not mention creating the glance database and adding permissions.

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

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-----------------------------------
Release: 15.0.0.0rc2.dev25 on 'Wed Aug 23 03:33:04 2017, commit 9820166'
SHA: 982016670fe908e5d7026714b115e63b7c31b46b
Source: https://git.openstack.org/cgit/openstack/glance/tree/doc/source/install/install-rdo.rst
URL: https://docs.openstack.org/glance/pike/install/install-rdo.html