Merge pull request #28040 from ibm-contribs/fixaddons

Automatic merge from submit-queue

Tracked addition of federation, sed support in kube DNS

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The kube DNS app recently gained support for federation (whatever that
is), including a new Salt parameter.  This broke the deployAddons.sh script for cluster ubuntu.  The DNS app also gained alternate
templates, intended to be friendly to `sed`.  Fortunately, those do
not demand a federation parameter.

This PR fixes up the ` cluster/ubuntu/deployAddons.sh` script to track those changes, by switching to the `sed`-friendly templates.

cluster/saltbase/salt/kube-dns/README.md

@@ -7,6 +7,14 @@ Due to a varied preference in templating language choices, the transform
 Makefile in this directory should be enhanced to generate all required
 formats from the base underscore templates.
 
+**NOTE WELL**: Developers, when you add a parameter you should also
+update the various scripts that supply values for your new parameter.
+Here is one way you might find those scripts:
+```
+cd kubernetes
+find [a-zA-Z0-9]* -type f -exec grep skydns-rc.yaml \{\} \; -print -exec echo \;
+```
+
 ## Base Template files
 
 These are the authoritative base templates.