Enable IPv4 forwarding at rooter startup

[seanthegeek]

Also add the --sysctrl option to the rooter.py CLI

[doomedraven]

qq, why do you write 0? with just run command it should be more than enough right?

[seanthegeek]

I'm guessing you meant 1 instead of zero. I thought the same thing, but the documentation says to do both, so I'm following the documentation.

https://capev2.readthedocs.io/en/latest/installation/host/routing.html

$ echo 1 | sudo tee -a /proc/sys/net/ipv4/ip_forward
$ sudo sysctl -w net.ipv4.ip_forward=1

It's also weird that the documentation is using tee -a to append to the file. We probably don't need that at all. I'll do some tests.

[seanthegeek]

Yep, only the sysctl command is needed. I removed the file edit from the PR.

[doomedraven]

thanks for PR