Allow many-to-many in hosts dnsmasq.dns.hosts attributes

Allow setting multiple IPs in the hostname => IP hash,
separated by spaces.
dnsmasq will answer queries with multiple A records.

Setting multiple hostnames already works as-is.

ex.: :hosts => { "example.com www.example.com" => "1.2.3.4 1.2.3.5" }

It's not the cleanest way, but it's backwards-compatible.