Automatic merge from submit-queue

no-snat test

This test checks that Pods can communicate with each other in the same cluster without SNAT.

I intend to create a job that runs this in small clusters (\~3 nodes) at a low frequency (\~once per day) so that we have a signal as we work on allowing multiple non-masquerade CIDRs to be configured (see [kubernetes-incubator/ip-masq-agent](https://github.com/kubernetes-incubator/ip-masq-agent), for example).

/cc @dnardo