Use address-family specific lists of addr/mask entries instead of

Use address-family specific lists of addr/mask entries instead of
a union that can store either ipv4 or ipv6.  The old method used
4x as much memory as was really needed for ipv4.  The spamd-setup
protocol has changed from: tag;message;a/m;a/m;a/m...\n
to :tag;message;af;count;a/m;a/m;a/m...[af;count;a/m;a/m;a/m]\n
OK phessler@ "nice" beck@