CA-46505: xapi nolonger has to attempt to re-infer per-VDI refcounts from its VBD state.
CA-46505: xapi nolonger has to attempt to re-infer per-VDI refcounts from its VBD state.

The state of each VDI on the host is being tracked explicitly by the xapi -> storage layer.

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

koushikcgit/xcp-rrdd,koushikcgit/xcp-networkd,sharady/xcp-networkd,djs55/squeezed,koushikcgit/xcp-rrdd,sharady/xcp-networkd,simonjbeaumont/xcp-rrdd,johnelse/xcp-rrdd,djs55/xcp-networkd,koushikcgit/xcp-networkd,djs55/xcp-rrdd,djs55/xcp-rrdd,robhoes/squeezed,johnelse/xcp-rrdd,djs55/xcp-networkd,simonjbeaumont/xcp-rrdd,koushikcgit/xcp-rrdd