Puppet::Node should log both hostname and domain when it cannot put together an FQDN

Puppet::Node needs two pieces of information to put together an "fqdn". It needs a hostname and the domain, which come from Facter. If it doesn't have one of these it prints out somewhat helpful error message: `Puppet.warning "Host is missing hostname and/or domain: #

"`

This could be improved by also logging both parameters, so one can tell which piece of information puppet couldn't find.

https://github.com/puppetlabs/puppet/blob/master/lib/puppet/node.rb#L147