Configurable concurrency for swift client.

The 'delete', 'download', and 'upload' commands use multiple threads
for concurrency. However, the number of threads was hardcoded at
10. This patch simply makes those configurable.

For example, if I'm downloading a lot of files but I don't want to
saturate the downstream on my Internet connection, I might choose to
use only 1 or 2 threads for object downloads. Conversely, if I'm
uploading a lot of small files across a fast network, I would want
lots of threads to speed things along.

The default number of threads is 10, so the default behavior is
unchanged.

Change-Id: I64c06741b24ca97fef5ded206d7e898bf5cab3b8

0 files changed, 0 insertions, 0 deletions