Fix path for swift functional tests.

- Fixes bug 1200711.

Change-Id: Ia92e5fa9a52af2a0b95314e5a726d47fa106eaae
Reviewed-on: https://review.openstack.org/36866
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins