CRM-16373 - Simplify UpdateConfigBackend and doSiteMove()
doSiteMove() has been performing a search-and-replace against data structures which haven't exist since at least 4.0; it seems quite unlikely that this works. Anecdotally, the workflow around this either incomplete or buggy/broken. Simplifying this is simply a reflection of the reality that it doesn't do what it was written to do. Instead, doSiteMove() now resets to a standard baseline/default.
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