Add ability for properties to be marked as system- or user-controlled
Some properties need to be marked as system-only, so that users cannot edit the properties and that users don't need to see these particular properties in the listing/showing of image metadata.
Whiteboard
I believe that we want users to be able to see these properties, but not be able to modify them. For example, we'd like to be able to use these properties:
* Rackspace-
* Operating System (Windows 2008, Ubuntu, etc.)
* Operating System Version (2.3.1, 4.0)
* Managed (available for managed customers)
* DiskManagement (auto, manual)
* Options (0, 2 - legacy billing requirement)
Some of these will be meaningless to the user, while others will be helpful (such as the "Rackspace-
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Add protected properties
Work Items
Dependency tree

* Blueprints in grey have been implemented.