Instead of implementing the same thing (fetch all default options,
and if the option that we are looking for is in that array, return that
array entry, and if not, return null) in a bunch of places (DefaultOptionsLookup and StaticUserOptionsLookup do this directly,
UserOptionsManager just delegates to DefaultOptionsLookup) put
this implementation in the parent class
Change-Id: If66f806bc4839f6c1143c5e0adda726c6ed04aae
Add a simple array-based implementation of UserOptionsLookup.
Useful for testing, and intricate enough that that each test should
not have to reimplement it individually.
Change-Id: Ibd23a7748509e1de199d19ac573741e0c2b51d2c
