Allow kube-dns to load its configuration from a config map

- Adds command line flags --config-map, --config-map-ns.
- Fixes 36194 (https://github.com/kubernetes/kubernetes/issues/36194)
- Update kube-dns yamls
- Update bazel (hack/update-bazel.sh)
- Update known command line flags
- Temporarily reference new kube-dns image (this will be fixed with
  a separate commit when the DNS image is created)

build-tools/kube-dns/Makefile

@@ -22,7 +22,7 @@
 # Default registry, arch and tag. This can be overwritten by arguments to make
 PLATFORM?=linux
 ARCH?=amd64
-TAG?=1.8
+TAG?=1.9
 REGISTRY?=gcr.io/google_containers
 
 GOLANG_VERSION=1.6