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 Can you describe the use case for creating a service from automate?  When created this way the service will not be tied to a service_template which is used for assignment of things like custom buttons and the retirement state_machine.