Stop putting env vars into BoundPods.

They will still show up in etcd.  They never were available
through the API.

A subsequent PR(s) will rip out all BoundPods code.
Working in small increments.

This PR will cause users on lagging cloud providers
to not get env vars in their pods if they update to this code.
They have already been warned via email.

Removed unit tests of BasicBoundPodFactory.
There is adequate coverage in pkg/kubelet/kubelet_test.go.

pkg/registry/etcd/etcd_test.go

@@ -27,7 +27,6 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/pod"
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/registrytest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/tools"
 
@@ -36,9 +35,7 @@ import (
 
 func NewTestEtcdRegistry(client tools.EtcdClient) *Registry {
 	registry := NewRegistry(tools.EtcdHelper{client, latest.Codec, tools.RuntimeVersionAdapter{latest.ResourceVersioner}},
-		&pod.BasicBoundPodFactory{
-			ServiceRegistry: &registrytest.ServiceRegistry{},
-		})
+		&pod.BasicBoundPodFactory{})
 	return registry
 }