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After the migration from pmacct to the ipt_NETFLOW kernel module the
"system flow-accounting vrf" node no longer had any effect on the export
path. NetFlow is emitted by the kernel module, so there is no daemon left
to wrap in "ip vrf exec" and the module socket was never bound to the VRF.
A collector reachable only inside a VRF therefore never received any flows
when the export was configured with a source-address.
Bind the export socket to a device via the ipt_NETFLOW "%device"
destination suffix: a per-server source-interface takes precedence,
otherwise the global VRF device is used, reproducing the previous
"ip vrf exec" behaviour. The module parses "@source-address" before
"%device", so the source-address is now rendered first - the previous
template emitted them in the opposite order, which only worked because the
two options are mutually exclusive per server.
Reject a source-interface that is used together with a VRF but is not a
member of that VRF: the exported flows would otherwise silently leave via
a different routing table. This mirrors the existing OSPF, OSPFv3, IS-IS
and BGP checks.
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