Update Horizon terminology relating to storage

    Currently, although the Horizon Hypervisors page only shows
    local storage and not storage, this is unclear from the
    terminology. Add 'local' to the description to clarify
    that only local storage is being reported.

    Closes-Bug: #1352405

Change-Id: Ic51d6cadc7a95ac1918d0cf7762600abe17941c0
Merge "Update Horizon terminology relating to storage"