Refactoring/cleanup of some view builders.

I have re-worked the "addresses", "flavors", "images", and "servers" view
builders to share logic which was previously duplicated across many ViewBuilder
classes. Also, I have re-worked the ViewBuilder class in general to persist
longer.

Overall we had good test coverage so not many tests had to be updated during
the refactor.

(Patch Set 2) Updated _set_request and _get_request to be a request property
              and a set_request method which can be overridden.
(Patch Set 3) Fixed tests that I broke with the last update.
(Patch Set 4) Changed "id in network.keys()" to "id in network"
(Patch Set 5) Feedback changes from bcwaldon
(Patch Set 6) Updated based on feedback from Waldon.
(Patch Set 7) Feedback from s1rp (Rick Harris)

Change-Id: I034404892018e99987f80789d7f7e406ff31658c

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