Automatic merge from submit-queue
rkt: Pass through podIP
This is needed for the /etc/hosts mount and the downward API to work.
Furthermore, this is required for the reported `PodStatus` to be
correct.
The `Status` bit mostly worked prior to #25062, and this restores that
functionality in addition to the new functionality.
In retrospect, the regression in status is large enough the prior PR should have included at least some of this; my bad for not realizing the full implications there.
#25902 is needed for downwards api stuff, but either merge order is fine as neither will break badly by itself.
cc @yifan-gu @dcbw
350efaf13d