libvirt hostnames..

Create ssh host <username>-<vmname> for libvirt

#1. Add this to TOP of ~/.ssh/config
    Include  ~/.ssh/config.d/*
   Top means top, specifically, do not add after a Host entry
   
#2. This bash function:
```bash
vmssh ()
{
    user=$1
    vm=$2
    shift
    shift
    ip=$(virsh domifaddr $vm | sed -n 's/.*\(192.168.122.[0-9]*\).*/\1/p')
    if [ x$ip != x ]
    then
	mkdir -p ~/.ssh/config.d
	CFG=~/.ssh/config.d/$user-$vm
	echo Host $user-$vm > $CFG
	echo HostName $ip >> $CFG
	echo User $user   >>  $CFG
	echo Ssh host  $user-$vm created.
    fi
}

```