Support --sport/--dport on ip6tables
MODULES-1355 - Add acceptance test to verify

Use the example rule from the ticket to make sure this is working

Fixes puppetlabs/puppetlabs-firewall#408
Merge pull request #451 from mhaskel/MODULES-1355

MODUELES-1355 - support dport/sport in ip6tables provider
MODULES-1612 - sync src_range and dst_range

The the firewall type and the ip6tables provider did not support
src_range and dst_range for ip6tables. Added this functionality.