[SPARK-5754] [YARN] Spark/Yarn/Windows driver/executor escaping Fix

This is my retry to suggest a fix for using Spark on Yarn on Windows. The former request lacked coding style which I hope to have learned to do better, and wasn't a true solution as I didn't really understand where the problem came from. Albeit being still a bit obscure, I can name the "players" and have come up with a better explaination of why I am suggesting this fix.

I also used vanzin and srowen input to *try* to give a more elegant solution. I am not so sure if that worked out though.

I still hope that this PR is a lot more useful than the last. Also do I hope that this is a _solution_ to the problem that Spark doesn't work on Yarn on Windows. With these changes it works (and I can also explain why!).

I still believe that a Unit Test should be included, kind of like the one I committed the last time. But that was premature, as I want to get the principal 'Go' from vanzin and srowen.

Thanks for your time both of you.

Author: Carsten Blank <blank@cncengine.com>
Author: cbvoxel <blank@cncengine.com>

Closes #8053 from cbvoxel/master.

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