net: disable dns error test
net: disable dns error test

some dns resolvers (opendns, for example)
are willing to make up results for any name.

R=agl, agl1
CC=golang-dev
http://codereview.appspot.com/152049
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go