Implement VDI.{create,destroy}
Implement VDI.{create,destroy}

We create 2 files:
  <path>/<name'>
  <path>/<name'>.json

Where <name'> is the VDI's name_label with a numerical suffix added
if necessary to guarantee uniqueness.

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

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