Updated openstack/openstack
Project: openstack/python-swiftclient  dfbb1807fb9ea041981193d05ada34da64afaeb2

Change tests to use new CaptureOutput class.

Added the ability to clear the buffers in the
CaptureOutput class so it can be easily used multiple
times in the same context manager.
Also added a option to suppress the SystemExit
associated with printing an error.

Change-Id: Ib59bbbe88256f215eed0a8ebc8282e02181d4377