Remove need for active accessKey in OSG/Walrus and removes ObjectStorage/WalrusComponentLoginModule. Fixes EUCA-8685 and EUCA-9100
Fix to get ObjectFactoryTest to pass the testMultipartUploadPartOverwrite test.

Fixed MPU upload record (ObjectEntity) should init to size 0, not -1. Also fixed the MPU bucket
size update to properly add the new size of the completed object and remove the part sizes.