Add support for service hierarchies

For multipart service deployments, parent/child
relationships between services can now be visualized
in the 'My Services' tree view.

The visibility of child services needs to be enabled
via the "display" attribute on MiqAeServiceService
for child services to appear in the hierarchy, by
default they are hidden. Also added an explicit
method for create new Service records via automation.

https://bugzilla.redhat.com/show_bug.cgi?id=1059834
@dillaman This validation should be moved into the real model.  It is likely not there today because we do not allow you to create a service_template in the UI without specifying a name.