Mock Resolv.getaddress in #host_to_ip
Mock Resolv.getaddress in #host_to_ip

Add an expect for Resolv.getaddress in Puppet::Util::Firewall#host_to_ip so
that the test can be run when disconnected from the net. Also isolates it
should should puppetlabs.com move to a different address.

ianand0204/puppetlabs-firewall,puppetlabs/puppetlabs-firewall,jaakkosipari/puppetlabs-firewall