virsh needs a flag for some systems

I had trouble setting this up for Fedora, but I've managed to solve it.

`virsh` commands needed root but I found the solution here: https://serverfault.com/questions/803283/how-do-i-list-virsh-networks-without-sudo

So instead of running `virsh` you'd need to run `virsh --connect qemu:///system`. This could be incorporated into the script (if the first virsh command fails try the second one).

I'm working around this issue by making a virsh wrapper on my user PATH