CA-38375: make absolutely sure that every VM has a VM_metrics record: an assumption made by other parts of the code.
CA-38375: make absolutely sure that every VM has a VM_metrics record: an assumption made by other parts of the code.

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

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