Make the unplug DISKS value a REG_MULTI_SZ instead of a REG_SZ
Make the unplug DISKS value a REG_MULTI_SZ instead of a REG_SZ

Signed-off-by: Paul Durrant <dba6cd059c0054f8a3c62ba902cd9d7238853ee4@citrix.com>

xenserver/win-xenvbd,xenserver/win-xenvbd,xenserver/win-xenvbd