Subject: Add Engine Config. Remove Building of Headers and Auth on/off
* Added the engine config import and obj
* Removed Auth on and off (no longer used by the tempurl tests)
* Removed the automagical building of headers
* Removed the deserilization (it was broken and unused)
* Removed requestlib kwargs from the method signatures because
  it had side-effects (calls working that shouldn't)

Change-Id: I77ba533cbeccd6459d8e3f2d975fdcae230917d0
Merge "Subject: Add Engine Config. Remove Building of Headers and Auth on/off * Added the engine config import and obj * Removed Auth on and off (no longer used by the tempurl tests) * Removed the automagical building of headers * Removed the deserilization (it was broken and unused) * Removed requestlib kwargs from the method signatures because   it had side-effects (calls working that shouldn't)"