Instantiate the xenstore client functor
Instantiate the xenstore client functor

This allows the CLI to build.

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

djs55/ocaml-vchan,mirage/ocaml-vchan,samoht/ocaml-vchan,mirage/ocaml-vchan,mirage/ocaml-vchan,djs55/ocaml-vchan,djs55/ocaml-vchan,samoht/ocaml-vchan,samoht/ocaml-vchan