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	Support for local data disk. Currently enable/disable config is at zone level, in subsequent checkins it can be made more granular.
    Following changes are made:
    - Create disk offering API now takes an extra parameter to denote storage type (local or shared). This is similar to storage type in service offering.
    - Create/delete of data volume on local storage
    - Attach/detach for local data volumes. Re-attach is allowed as long as vm host and data volume storage pool host is same.
    - Migration of VM instance is not supported if it uses local root or data volumes.
    - Migrate is not supported for local volumes.
    - Zone level config to enable/disable local storage usage for service and disk offerings.
    - Local storage gets discovered when a host is added/reconnected if zone level config is enabled. When disabled existing local storages are not removed but any new local storage is not added.
    - Deploy VM command validates service and disk offerings based on local storage config.
    - Upgrade uses the global config 'use.local.storage' to set the zone level config for local storage.
(cherry picked from commit 62710aed37606168012a0ed255a876c8e7954010)