Revert "Configure swift credentials for workers to push to"

This reverts commit 176f15cd48ceea7e990fc61362875a23524f963a.

Puppet and zuul aren't ready for this. The swift client throws an
exception. We need to restart zuul to fix a more pressing issue hence
this revert. Will debug when able to.

Change-Id: Ie4487d84b7f1495c7ec6fd31e4b5b90d6699a31d
Merge "Revert "Configure swift credentials for workers to push to""