Separate object-storage bulk operation service clients

Swift support bulk operation for upload archive file and bulk
delete. Service client methods for those API request are
present in account_client.py

This patch separate those methods in new client and use accordingly.

Partially implements blueprint consistent-service-method-names

Change-Id: Icceaf1bf4eddd2cf6501e76e52b54de2e105a165
6 files changed