Well, if it comes to that you access the MD's tree in the /usr/pluto/diskless/# directory (where # is your MDs device ID). So something like this to create/edit your hosts file:
sudo nano /usr/pluto/diskless/80/etc/hostsYou'll want that file to include this line:
But like I said, only if it comes to that - this file is supposed to be generated automatically, and if this is necessary it means that the closing quote isn't the whole story for this issue. In that case it might be safer to wait and get the official fix before you create your MDs.
Edit: Just saw your latest post. If you decide to proceed, you can try the hosts file fix. But I'm really out of my depth as far as the MD creation process, and just repeating what possy walked us through in IRC. You may want to drop in there for help or wait for the official fix.