Split CA parameters on manifest template expansion

Split arguments to be passed to cluster autoscaler binary,
so each argument is passed separately.
This is preparatory work for migrating CA to disroless base image
and passing multiple arguments together does not work if CA is
not wrapped around with shell script

Change-Id: I26b5a764d2a12079c7f4ed6633ccabf8d623e232

cluster/gce/gci/configure-helper.sh

@@ -2164,7 +2164,13 @@ function start-cluster-autoscaler {
 
     local params="${AUTOSCALER_MIG_CONFIG} ${CLOUD_CONFIG_OPT} ${AUTOSCALER_EXPANDER_CONFIG:---expander=price}"
     params+=" --kubeconfig=/etc/srv/kubernetes/cluster-autoscaler/kubeconfig"
-    sed -i -e "s@{{params}}@${params}@g" "${src_file}"
+
+    # split the params into separate arguments passed to binary
+    local params_split
+    params_split=$(eval "for param in $params; do echo -n \\\"\$param\\\",; done")
+    params_split=${params_split%?}
+
+    sed -i -e "s@{{params}}@${params_split}@g" "${src_file}"
     sed -i -e "s@{{cloud_config_mount}}@${CLOUD_CONFIG_MOUNT}@g" "${src_file}"
     sed -i -e "s@{{cloud_config_volume}}@${CLOUD_CONFIG_VOLUME}@g" "${src_file}"
     sed -i -e "s@{%.*%}@@g" "${src_file}"

cluster/gce/manifests/cluster-autoscaler.manifest

@@ -34,7 +34,7 @@
                     "--write-status-configmap=true",
                     "--balance-similar-node-groups=true",
 		    "--expendable-pods-priority-cutoff=-10",
-                    "{{params}}"
+                    {{params}}
                 ],
                 "env": [
                     {