Added XML files for default ports sect and tables

This patch adds XML files for:
- brief overview of firewall configuration
- table listing ports used by main openstack components
- table listing ports used by other services required by OpenStack

The resulting section will be added as an appendix to the Config Ref
Guide.

Change-Id: Ib7edf8f827cd0c31c51a9cbdaff475384960c7ee
Related-Bug: #1261617
Merge "Added XML files for default ports sect and tables"