Volume.create: actually create real files with unique names
Volume.create: actually create real files with unique names

We base the names off the VDI name_label, with a suffix to make them
unique.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@citrix.com>

xapi-project/ffs,djs55/ffs,robertbreker/ffs,franciozzy/ffs