A number of the nwfilter XML files have attribute values
which are out of range. Previously the libvirt nwfilter
XML parser would silently ignore illegal values, causing
them to default to 0. This resulted in creating incorrect
iptables rules, which the TCK suite then validated as
correct. Current libvirt returns a hard error for illegal
XML values. To address this we either change the attribute
values to be valid, or delete the bogus rules entirely if
they are duplicates of other existing valid rules.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>