Fix IPv6 localhost replacement in Swift container sync test
Fix IPv6 localhost replacement in Swift container sync test

The local IP is replaced with a wrong and irregular value
if tested with IPv6. This patch fixes this, replacing the
netloc with the right IPv6 localhost value.

Closes-Bug: 1944728
Change-Id: Icb3668abebb4821f1cf4824f4898abb2163e4d99

openstack/tempest,openstack/tempest