Watch delivers current state for resourceVersion=0

Allows clients to get the current state without having to execute
a get followed by a watch.  Makes integration with action loops
much cleaner.
Expand api ResourceVersioner test
Add a resource for pods per minion

Returns an api.PodList with a resource version set appropriately.
Uses the field interface to select a minion to watch:

    /minionPods/watch?fields=minion%3D127.0.0.1
Replaces etcd watching on the Kubelet with API

Disables etcd configuration loading if the apiserver_endpoint
parameter is provided.  Depends on the Watch implementation of
MinionPods and adds Client methods for that.  Depends on Watch
returning the full state when resourceVersion is unspecified.