test: check that parent locators of the form ../foo.vhd work
test: check that parent locators of the form ../foo.vhd work

This problem was found by XenRT IntelliCache tests. This test
currently fails, because the workaround is only in vhd-tool.

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

xapi-project/ocaml-vhd,djs55/ocaml-vhd