OCI network stack

Netavark is a rust based network stack for containers. It is being
designed to work with Podman but is also applicable for other OCI
container management applications.

Netavark is a tool for configuring networking for Linux containers.
Its features include:
* Configuration of container networks via JSON configuration file
* Creation and management of required network interfaces,
including MACVLAN networks
* All required firewall configuration to perform NAT and port
forwarding as required for containers
* Support for iptables and firewalld at present, with support
for nftables planned in a future release
* Support for rootless containers
* Support for IPv4 and IPv6
* Support for container DNS resolution via aardvark-dns.