cmd/coordinator: remove Kubernetes resize code

The Google Container Engine API began returning InstanceGroup
rather than InstanceGroupManager URLs, breaking the code
that downsizes the cluster. Resize code is being removed for
now, to be replaced by the autoscaler API soon.

Change-Id: I5baedcc09627f3443e93f931cd0993ac45430c35
Reviewed-on: https://go-review.googlesource.com/18305
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2 files changed