Some functional tests for object versioning

Also fix some exception-handling stuff in functional tests; at some
point, ResponseError() started needing two more parameters, but the
functional tests (not swift_test_client, just tests.py) still had a
couple spots that were not passing in the new params. Now they're
optional again, and if you omit them, then the stringification of the
ResponseError is just a little less useful than it could be.

Change-Id: I38968c4b590fc04b97b85c5f974c8648291a6689
Config option to lower the timeout for recoverable object GETs.

Change-Id: I71f9824559126e4025e7629715ab9dac64231e09
Merge "Config option to lower the timeout for recoverable object GETs."
Merge "Some functional tests for object versioning"