Spot check more hashes for increase_part_power
Spot check more hashes for increase_part_power

Just a touch of cleanup to the unittest to demonstrate the stability of the
guarantee that objects will hash to the same nodes but have different parts.

Change-Id: I4a24187755455366a6435816a138f6175ae713a4

openstack/swift,swiftstack/swift,redbo/swift,tipabu/swift,williamthegrey/swift,nadeemsyed/swift,notmyname/swift,psachin/swift,clayg/swift,williamthegrey/swift,prashanthpai/swift,tipabu/swift,matthewoliver/swift,hurricanerix/swift,notmyname/swift,hurricanerix/swift,revoer/keystone-8.0.0,hurricanerix/swift,notmyname/swift,openstack/swift,psachin/swift,nadeemsyed/swift,swiftstack/swift,larsbutler/swift,psachin/swift,hurricanerix/swift,notmyname/swift,psachin/swift,clayg/swift,smerritt/swift,aerwin3/swift,aerwin3/swift,smerritt/swift,openstack/swift,openstack/swift,prashanthpai/swift,smerritt/swift,nadeemsyed/swift,matthewoliver/swift,clayg/swift,redbo/swift,matthewoliver/swift,tipabu/swift,matthewoliver/swift,nadeemsyed/swift,swiftstack/swift,larsbutler/swift,clayg/swift,tipabu/swift,revoer/keystone-8.0.0,smerritt/swift