Clean up some newline issues

Not having the newline was preventing my unbound server from reading the
configuration correctly.  This ammends the previos epic PR to include
newlines.  While I was at it, I devided to squash the logic to avoid
checking for an array.
```erb
Array(@address).each do |addr| -%>
```
should do the same:

```console
[6] pry(main)> addresses = [ '192.168.122.13', '172.17.42.12' ]
=> ["192.168.122.13", "172.17.42.12"]
[7] pry(main)> Array(addresses).each { |addr|  puts "    stub-addr: #{addr}\n" }
    stub-addr: 192.168.122.13
    stub-addr: 172.17.42.12
=> ["192.168.122.13", "172.17.42.12"]
[8] pry(main)> [addresses].flatten.each { |addr|  puts "    stub-addr: #{addr}\n" }
    stub-addr: 192.168.122.13
    stub-addr: 172.17.42.12
=> ["192.168.122.13", "172.17.42.12"]
```