net: make use of reflect.DeepEqual in IP manipulation tests
net: make use of reflect.DeepEqual in IP manipulation tests

Also applies camel style to test case holders.

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/7884043

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