Add path option for cgroup

[rodehoed]

Use Case

Using a cgroup path is much easier to maintain and understand then the net_cls cgroup ID

Describe the Solution You Would Like

When using the the cgroup option also support a path. Right now this done this way: -m cgroup --cgroup , but the path option would like this: -m cgroup --path 'system.slice/example.service' .

Describe Alternatives You've Considered

Well using the ID can be hard to find

Additional Context

I think for backward compatibility; you could make the parameter for cgroup like this:

• if VALUE is numeric, then presume an net_cls cgroup ID and use --cgroup
• if VALUE is a string (and maybe look for '/') use --path

converted to iptables it would look like:

iptables -A OUTPUT -p tcp --sport xxxxx -m cgroup --path system.slice/example_jump.service  -j ACCEPT