(#215) Add support for IP range
(#215) Add support for IP range

Add support for filtering by source and destination IP range, equivalent to '-m iprange --src-range|--dst-range',
which is only allowing a specified IP range. Excluding an IP range, '! --src-range or ! --dst-range', is not supported.

Add ':src_range' and ':dst_range' to firewall.rb

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