Revert "A 401 error should result in re-authenticating for a new token"

This reverts commit 833f046a5ce54b1fc1ea1674d3baf743143fb517.

References JCLOUDS-231
Enable time-bound signed URL tests for HPCS.

HP does, in fact, support configurable temporary signed URLs:
http://docs.hpcloud.com/api/object-storage#temp_url

References JCLOUDS-231