news/inn: Ignore more domain/FQDN errors for poudriere
The builder environment doesn't have a vaild FQDN so this is failing a
downstream port build.
Reported by: thierry
For the inn ports:
- Fix build in the case where the host machine has either no DNS, or an
incomplete hostname.
- Use a generic placeholder in the default config file rather than the
build machine's name.
- Pet portlint(1) while here.