Fallback Keys

Add a mechanism to check for a fallback key if set, to enable rotating keys with no interrupted access. The tempurl middleware uses a similar facility by storing Temp-Url-Key and Temp-Url-Key-2.

Transcript from #swift IRC

<torgomatic> thurloat: the one bit of feature creep I'd suggest (there's always something, right?) is the ability to have two read keys and two write keys; that way you can rotate credentials without downtime
<torgomatic> tempurl has something similar
<torgomatic> but right now, if you have apps using those keys, you can't change the keys without inducing downtime, whereas if you allowed for two, you could

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