The traditional definition of the three Resource categories is:

* platform - a machine (may be physical or virtual)
* server - a process running on a machine
* service - some entity within a process

Over the years, we have made a handful of deviations from these
definitions, defining certain entities within processes as servers,
rather than services. Some examples are the "Embedded Tomcat Server"
type from the as4 plugin, and the "JBoss AS JVM" and other "xxx JVM"
types. IMO, these should all be switched over to services, so we are
consistently following the above definitions.

Besides the inconsistency in what it means to be a server, there's
something else about having all these non-top-level server types that
annoys me on a regular basis. When I go the Inventory > Servers, I want
to get a nice listing of all the server processes in my inventory.
Instead, that list is cluttered by various JVM's and embedded Tomcat
"servers", and there's no easy way to filter those out.

And one final point - we actually have added special code in a bunch of
places to handle "top-level" servers differently than other servers. For
example, we auto-import non-top-level servers just like services
(because they should *be* services!).

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Here are the Resource types whose category should be changed from SERVER to SERVICE:

- AS7 plugin: all subsystem types (Stefan and Simeon are taking care of these)
- AS5 plugin: "JBoss AS JVM" type
- AS4 plugin: "Embedded Tomcat Server" and "JBoss AS JVM" types
- JBoss Cache plugin: "JBossCacheSubsystem" type
- Tomcat plugin: "Tomcat Server JVM" type
- RHQ Agent plugin: "RHQ Agent JVM" type