container/container.go: InitialNodeCount is always zero

The InitialNodeCount in the cluster(s) response is always zero so it is
not a useful metric to return. The more interesting metric is the
CurrentNodeCount. A similar argument could be made for the
InitialClusterVersion but this should be addressed in a separate commit
if it is decided that it should be changed

Change-Id: Ic2b8ebafb59324da75e7ae3192c2fbb6fc121896
Reviewed-on: https://code-review.googlesource.com/12450
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/container/container.go b/container/container.go
index a2de7b0..3f59527 100644
--- a/container/container.go
+++ b/container/container.go
@@ -147,7 +147,7 @@
 		Description:       c.Description,
 		Zone:              c.Zone,
 		Status:            Status(c.Status),
-		Num:               c.InitialNodeCount,
+		Num:               c.CurrentNodeCount,
 		APIVersion:        c.InitialClusterVersion,
 		Endpoint:          c.Endpoint,
 		Username:          c.MasterAuth.Username,