Error during post-config

[chrisparnin]

I believe this is mostly informational, but we get this when setting the ip address.

received from ssh server:  SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
Error executing command: sudo ip addr flush dev enp0s8
{
  stdout: '',
  stderr: '/usr/bin/xauth:  file /home/vagrant/.Xauthority does not exist\n',
  exitCode: 0
}

This is likely being caused by flags inside ssh/exec for infra.connectors related to a X-server. We probably don't want that on by default.