Added new projectaccounting query to get project's single bucket usage rollup.
Added new service method to call new query.
Added implementation for IsAuthenticated method which is used by new generated API.
Change-Id: I7cde5656d489953b6c7d109f236362eb465fa64a
Added a feture flag which will be used to indicate if new generated console api is used.
Fixed some comments from previous PR.
Change-Id: Ice31c998b0b347028a491c971a648fd1269bfd49