Add u32 to recognized modules

[mohammed-elhakim-sociomantic]

Similarly to https://tickets.puppetlabs.com/browse/MODULES-6379, we are getting warnings for u32:

Warning: Puppet::Type::Firewall::ProviderIptables: Skipping unparsable iptables rule: keys (5) and values (9) count mismatch on line: -A cali-fw-cali08818b3e1e0 -p udp -m comment --comment "cali:mpXsk9dUM2JyVL-L" -m comment --comment "Drop VXLAN encapped packets originating in pods" -m multiport --dports 4789 -m u32 --u32 "0x0>>0x16&0x3c@0xc>>0x8=0x1000" -j DROP

This fixes that

[lionce]

Hey @mohammed-elhakim-sociomantic ,

Thank you for this fix. It looks good to me, but the new rule should be tested. Would be possible to add a test to cover this?

Cheers!

[sanfrancrisko]

Thanks again for the submission @mohammed-elhakim-sociomantic . I've merged this as part of this PR: #917 as I didn't want to rebase master on your fork with active branches still being worked upon.