Create a Swift client class

[Murali Allada]

We need to create a swift client class for common code.

We currently upload logs and images to swift in two ways.
- Using the python swift client directly to upload logs
- Using a stand alone python script which is called from our bash scripts to upload images.

We need to consolidate these two so we have a common place for our swift integration code which supports the following

- Upload objects to swift in chunks.
- Check object size to make sure we are under the 5GB swift constraint.
- Retry logic
- Deleting objects

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/184335

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/184335
Committed: https://git.openstack.org/cgit/stackforge/solum/commit/?id=40048923a45f468579b2fb62614852b50d2333aa
Submitter: Jenkins
Branch: master

commit 40048923a45f468579b2fb62614852b50d2333aa
Author: Murali Allada <email address hidden>
Date: Tue May 19 16:32:19 2015 -0500

    Swift client wrapper

    We currently upload logs and images to swift in two ways.
    - Using the python swift client directly to upload logs
    - Using a stand alone python script which is called from our bash
      scripts to upload images.

    We need to consolidate these two so we have a common place for our
    swift integration code which supports the following

    - Upload and download objects.
    - Check object size to make sure we are under the 5GB swift
      constraint.
    - Retry logic
    - Delete objects

    I'm also changing the swift client code to always create a
    non cached client. This is required for our upload\download
    retry mechanism to work properly.

    Change-Id: I9993d0b74197a517920468b7fd07e29bbc305ed0
    Closes-bug: 1456807