KNOX-176: Per Service overrides of Provider parameters

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

I'm interested in getting input about this jira.
https://issues.apache.org/jira/browse/KNOX-176

The context that brought this up is that we would like to be able to 
limit the amount of body content that HttpClientDispatch will buffer in 
certain circumstances having to do with how SPNEgo works.  So basically 
we want to let the customer possibly change this limit value someday via 
Ambari.  the question is how should we represent this information in the 
topology file.

Please contribute your thoughts via jira comments.

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