Like Cinder, Manila has a scheduler that operates (among other things)
on extra spec values in share types to determine which backend should
receive a new share. In Kilo, Manila will adopt the pools feature from
Cinder, such that the scheduler may choose from more than one storage
destination per backend. This commit adds a couple of per-pool
attributes to the share stats reported by the cDOT driver to the scheduler,
including aggregate disk type and RAID type.
Implements blueprint cdot-storage-service-catalog
Change-Id: Ice616d4189832d0e4b1a0fdfdd31b82b8c0a831d
2e2b718edd