Use same helm wrapper script for all nodes

The helm wrapper script should be the same for genesis and non-genesis
nodes. The one previously used by join nodes is removed.

Change-Id: I212127f258b9eba4fce776cb690060dc413061ca

promenade/templates/roles/join/usr/local/bin/helm

@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-if [ "x$(pwd)" = "x/" ]; then
-    UPDIR=/
-    WORKDIR=/
-else
-    UPDIR=$(pwd)/..
-    WORKDIR=/up/$(basename $(pwd))
-fi
-
-exec docker run --rm -it \
-    --net host \
-    -v $UPDIR:/up \
-    -v /etc/kubernetes/admin:/etc/kubernetes/admin \
-    -w $WORKDIR \
-    -e KUBECONFIG=/etc/kubernetes/admin/kubeconfig.yaml \
-    {{ config['HostSystem:images.helm.helm'] }} \
-        $*