Allow packets capture using dump rules

[GeorgyKirichenko]

YANET DataPlane supports three types of special interfaces designed to capture packets: inbound, outbound, and drop.
However, all of them have serious problems in production:

• limited bandwidth between the Linux kernel and YANET even for the virtio driver - most packets are silently dropped even before pcap filtering
• high packet transmission rate distorts the kernel connection using the default interface, which disrupts bird sessions
• abuse of kernel interrupts
• no internal filtration

The basic idea is to embed dump rules into the YANET ruleset and then capture packets from shared memory using a special utility.