Add dedicated network interface for SSH

[markusalbe]

Hey Nickolay! Here's one more idea:

Add a second network interface to handle only the ssh traffic, so that we use iptables/qdisc to break the network connecting the services and clients , and still be able to access the nodes.

[ihanick]

Hi @markusalbe ,
With default docker provider there is an anydbver exec node0 command similar to anydbver ssh node0, but it works even if the network is blocked. Please re-open if it's not enough