Install and configure for Ubuntu in aodh

[KI4RBC]

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: ______

    https://docs.openstack.org/aodh/latest/install/install-ubuntu.html
    at "Finalize installation" the documentation states to do a service
    aodh-api restart. I find, however, that the aodh api is ran as a WSGI
    from Apache2

- [ ] 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: 5.0.1.dev50 on 2017-12-15 15:31
SHA: b4a64743780b7a930146b195df64c06a342cd855
Source: https://git.openstack.org/cgit/openstack/aodh/tree/doc/source/install/install-ubuntu.rst
URL: https://docs.openstack.org/aodh/latest/install/install-ubuntu.html

[gordon chung (chungg)]

if someone wants to fix this: https://github.com/openstack/aodh/tree/master/doc/source/install

[KI4RBC (mikemcdonough)]

I guess I'll give it a shot