tests for relink rehash
tests for relink rehash

Co-Authored-By: Alistair Coles <bff10adc6d48cb5e5ff09587eb6eae873c696986@gmail.com>
Change-Id: Id9b295f4288054ce08dcd579f4e0526e304229b5

openstack/swift,tipabu/swift,openstack/swift,openstack/swift,tipabu/swift,tipabu/swift,openstack/swift,tipabu/swift