Reordered hostnames in /etc/hosts for 172.18.96.1

Since we're running a dhcp server, for hostname -f to report schoolserver.local, that must come first in /etc/hosts for the LAN interface.
Template for /etc/hosts not needed as it's generated from the network playbook
/etc/sysconfig/network must have the FQDN for HOSTNAME
#TODO remove deprecated HOSTNAME entry
Merge pull request #21 from annabham/bug--am-sick-of-hostname-issues

Reordered hostnames in /etc/hosts for 172.18.96.1