swift-bench now honors the environment variables, ST_AUTH, ST_USER, and
ST_KEY like python-swiftclient does.
Added --lower-object-size (or -l) command-line option which, if
specified, will turn a specified --object-size into --upper-object-size.
It will raise a ValueError if --object-size is not specified or is <=
BenchController how handles SIGINT (KeyboardInterrupt) similarly to the
swift command-line client: the first Ctrl-C will make it fast-track to
completion (no new PUT or GET operations are started, but everything PUT
is DELETE'ed). A second Ctrl-C will immediately exit. The behavior for
SIGTERM is unchanged (a single SIGTERM will immediately terminate the
Added a sample configuration file for swift-bench, with documenting