use less-cpu intensive spoof calc

git-svn-id: http://svn.vuze.com/public/client/trunk@40207 c2c1b7af-1477-405b-86ee-8aefd1fc4dd2
better dht unloading

git-svn-id: http://svn.vuze.com/public/client/trunk@40208 c2c1b7af-1477-405b-86ee-8aefd1fc4dd2
prevent unwanted attempted DNS resolution

git-svn-id: http://svn.vuze.com/public/client/trunk@40211 c2c1b7af-1477-405b-86ee-8aefd1fc4dd2
minor fixes

git-svn-id: http://svn.vuze.com/public/client/trunk@40212 c2c1b7af-1477-405b-86ee-8aefd1fc4dd2