CP-3625: Implemented metrics pif_aggr_tx and pif_aggr_rx for aggregated rx/tx traffic across all PIFs
CP-3625: Implemented metrics pif_aggr_tx and pif_aggr_rx for aggregated rx/tx traffic across all PIFs

Signed-off-by: Vincent Bernardoff <8e5719c1570e7a2e4cdddc970cf6a6ad782911a1@ocamlpro.com>

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