Refresh and enrich ServiceGroups from sample data

[gregcorbett]

Follows on from #394

• Extend lib/Doctrine/deploy/AddServiceGroups.php so that it can create ServiceGroups that actually contain Services
• Add lib/Doctrine/deploy/AddServiceGroupRoles.php so that ServiceGroup level roles can be created.
• Refresh lib/Doctrine/deploy/sampleData/ServiceGroups.xml and /lib/Doctrine/deploy/sampleData/ServiceGroupRoles.xml to be consistent with the rest of the sample data.

The best way to tackle this may be to deploy the existing sample data to an instance, create some ServiceGroups in the UI, then use the API output to update the ServiceGroups.xml. Because the GOCDB UI doesn't let you request a role on behalf of a user, ServiceGroupRoles.xml can start from the API output but then it will have to be manually updated to include user roles.