CP-11136: Fix compilation after merge to master
CP-11136: Fix compilation after merge to master

In xapi_vm_helpers.ml, the "Client" identifier was binding to a
module in Xenstore.  Fixed by no longer opening the Xenstore module.

Commit 6 of 7 for this feature.

Signed-off-by: Thomas Sanders <c547603d2dd860735c4f0c043b1348f5c48c02f8@citrix.com>

cheng-z/xen-api,cheng--zhang/xen-api,cheng-z/xen-api,cheng--zhang/xen-api,cheng-z/xen-api,cheng--zhang/xen-api,cheng-z/xen-api,cheng-z/xen-api,cheng--zhang/xen-api,cheng-z/xen-api,cheng-z/xen-api,cheng--zhang/xen-api,cheng--zhang/xen-api,cheng--zhang/xen-api