Exclude tests for Puppet < 3.2 against ruby-head
Exclude tests for Puppet < 3.2 against ruby-head

ruby-head is currently 2.x, which Puppet only began supporting at version
3.2: http://projects.puppetlabs.com/issues/18494

This should make the "allowed failures" builds green once again.

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