Put some comments in places we get asked about a lot

Change-Id: If932b82f4e225cfdda21f47e4215c6f4c59dae4a
Fixed probetests

* Fixed issue with running probetests with the latest update
  of python-swiftclient that removed eventlet
* Fixed issue with replication server tests to not require hard
  coded paths

Change-Id: Ibbf727ae99c0f3893ae58e270e2f879a1f618e49
Merge "Fixed probetests"
Move parse search logic outside from builder

Dramatic part of RingBuilder.search_devs which parse a complex format
of a search device string moved to the swift-ring-builder script.
Instead, the search_devs has a simple interface to search devices.

blueprint argparse-in-swift-ring-builder

Change-Id: If3dd77b297b474fb9a058e4693fef2dfb11fca3d