[CA-32841] Ensuring that Xapi populates VM memory overhead fields on import.
[CA-32841] Ensuring that Xapi populates VM memory overhead fields on import.

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