BOLO: Changed OOTB install to use sandbox instead of sample

[Kevin Minder <ke...@hortonworks.com>]

This affects all client samples because the URL changes from
https://localhost:8443/gateway/sample
to
https://localhost:8443/gateway/sandbox
Since the sample.xml was ending up to be fairly sandbox specific this 
seemed like a good idea.

I have not updated all of the 0.3.0 site docs yet.  I'm going to do an 
editing pass of the site early next week and I'll make those updates.


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