I'm doing some enhancements to how the slider XML conf publishes
information, and I've just noticed that we aren't resolving XML conf values
until the client.

If the AM publishes a hadoop site XML with

key1=word
key2=${key1}

Then it will be published as is. The json and .properties format will end
up with key2== ${key1}.

If you load it into a Hadoop configuratin object client side, and ask it
for "key2", you will get back "word", because it's being done client-side.

I've filed a JIRA, https://issues.apache.org/jira/browse/SLIDER-52 -just an
FYI until then. The fix will be to go through the keys and resolve them,
rather than just enumerate the entries

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