Adding foreman + ovirt + salt workflow digram

Hope this workflow digram explains how the VM gets provisioned on a compute node such as oVirt and configuration management like salt.

Kind Regards,
Sherif
![workflow](https://cloud.githubusercontent.com/assets/1666001/5508035/9a9b99e0-87a0-11e4-814f-86ec52e1b16a.jpg)