When the account response includes 'X-Storage-Policy-X-Container-Count' the
command helpers will stick a helpful extra line in the output.

If the swift response doesn't include the information the behavior is
unchanged.

Change-Id: Iaaa55d207ebe6a9c16e52adb56eb858c57cfb26a

This patch adds a SwiftService class that incorporates the high
level logic from swiftclient/shell.py. It also ports shell.py to
use the new class, and updates the code in swiftclient/multithreading.py
to allow the SwiftService to be used for multiple operations whilst
using only one thread pool.

Currently, code that imports swiftclient has to have its own logic for
things like creating large objects, parallel uploads, and parallel
downloads. This patch adds a SwiftService class that makes that
functionality available in Python code as well as through the shell.

Change-Id: I08c5796b4c01001d79fd571651c3017c16462ffd
Implements: blueprint bin-swift-logic-as-importable-library

Storage policy stats was not well parsed in account stat. This
patch parses the stats and print out the stats in a format like below:

$swift -A http://swift_cluster/auth/v1.0 -U test:tester -K testing stat
                   Account: AUTH_test
                Containers: 5
                   Objects: 1
                     Bytes: 2097152
Objects in policy "golden": 1
 Bytess in policy "golden": 2097152
Objects in policy "silver": 0
  Bytes in policy "silver": 0
               X-Timestamp: 1404697760.88809
                X-Trans-Id: txec519e24b44a413abb705-0053da2dcb
              Content-Type: text/plain; charset=utf-8
             Accept-Ranges: bytes

Change-Id: I7ad0ee6d88f8393e3a93e90cd52b9b592da7072d

Coverage for swiftclient.client is 71% with these tests.

Unit tests have been moved into another subdirectory
to separate them from functional tests.

Change-Id: Ib8c4d78f7169cee893f82906f6388a5b06c45602