Add unit test coverage for CleavingContext.done()
Add unit test coverage for CleavingContext.done()

Change-Id: Ica983aa13a7bcd07bc73c68f3938b190c4bbaa3d

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