Bug 1144146 - Messaging queue and subscriber runtime is not exposed

Added 2 new resource types to AS7 plugin (for Standalone and Managed server)
with supportsMissingAvailabilityType="true", because runtime-queues and
topic subscribers will likely appear and disappear.

BaseComponent#getAvailability() was fixed to support
supportsMissingAvailabilityType=true whenever it is defined in resource
type.