DRILL-5431- SSL support design doc

[Parth Chandra]

I posted this in the JIRA but it appears there are no notifications on the
dev list, so am re-posting it.

https://docs.google.com/document/d/1ghUnblzttRj94mdAaq7HzlIe0EdQc59qSeCoAr-vRZw/edit#



Parth