Fully compare the lists rather than only counting objects.
Also fix comparison problem in Nodecon and Genfscon. In libqpol, the all
genfscons/nodecons iterators allocate new objects, so the pointer
comparison in PolicySymbol fails.
Python 3.3's IPv6Network constructor does not support an expanded netmask
for specifying the network, only CIDR. Convert all netmasks to CIDR.
The code does not verify that the orignal expanded netmask from the policy
is correct; it counts all set bits in the netmask.
Also add IPv6 NodeconQuery unit tests.
