Rename socket_proxy to zsocket_proxy

[DennisGaida]

docker-compose v2 had network priority, unfortunately docker-compose v3 does not have this functionality (yet?). See docker/cli#1372

Networks are assigned to containers using alphabetical order, in this case it means that "socket_proxy" is always ordered before "t2_proxy", this in turn means that the default gateway in containers is always the "socket_proxy" gateway and therefore the outgoing IP address to other containers. I believe this is wrong and the outgoing containers' IPs should always be the default networks gateway and respective IP as well as the traefik containers' IP - never the socket-proxy IP.

I recently ran into this problem due to Authelia refusing oauth requests from container-to-container since I didn't allow the socket-proxy network to communicate via Authelia (because why should it, it should always just be container <-> docker sock).

Taking the traefik container as an example:

Before the change

$  docker exec traefik route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.91.1    0.0.0.0         UG    0      0        0 eth0
192.168.90.0    *               255.255.255.0   U     0      0        0 eth1
192.168.91.0    *               255.255.255.0   U     0      0        0 eth0

After the change

(note the assignment of eth0/eth1)

$  docker exec traefik route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.90.1    0.0.0.0         UG    0      0        0 eth0
192.168.90.0    *               255.255.255.0   U     0      0        0 eth0
192.168.91.0    *               255.255.255.0   U     0      0        0 eth1

This could have been changed in docker-compose v2 with the priority attribute (assigning e.g. priority: 10 to the traefik proxy network), but this just doesn't work with docker-compose v3. 😐

[htpcBeginner]

Sorry for the delay. The reason i havent' merged this yet is because i will have to modify a whole bunch of documentation to reflect this.