net: remove unnecessary newline in testing.Logf from tests
net: remove unnecessary newline in testing.Logf from tests

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/6434043

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang