Bail out a little faster when object write affinity is off

This function was calling a couple functions prior to checking for
early bailout; if it did bail out, the results of those function calls
were unused. Bail out earlier to avoid wasted work.

Change-Id: Ia023549a45355b44ebfb41212565c42f993415a9
Update the swift documentation theme

Currently the theme used by the swift developer docs are out of
date, it should be using oslosphinx, to provide a similar look
and feel between all openstack related projects.

Change-Id: Id7c226cdc13c6c4f3b5082b1ef4dfe09966b21ec
Merge "Bail out a little faster when object write affinity is off"
Merge "Update the swift documentation theme"