Comment 7 for bug 1087183

About Scott's (a) point, the debian document says you should have host.domain in /etc/hosts if the system has a permanent address, and the host.domain line should be for that address, not 127.0.1.1:
"""
For a system with a permanent IP address, that permanent IP address should be used here instead of 127.0.1.1.

For a system with a permanent IP address and a fully qualified domain name (FQDN) provided by the Domain Name System (DNS), that canonical <host_name>.<domain_name> should be used instead of just <host_name>.
"""

Now, is a dhcp lease a permanent address? :) I think it's permanent enough for this scenario where MAAS is giving it out, as it even updates the DNS record.