Add ability to control devMode per request
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                 Key: WW-3546
                 URL: https://issues.apache.org/jira/browse/WW-3546
             Project: Struts 2
          Issue Type: New Feature
          Components: Core Interceptors, Dispatch Filter, Plugin - JSON
    Affects Versions: 2.2.1
            Reporter: John Lindal
            Priority: Minor


I have found it useful to be able to control "debugging mode" on a per-request 
basis.  It makes it easier to track down problems reported in production that 
are hard to reproduce in a development environment.

The places that I have found where it would be useful to control devMode are:  
Dispatcher.sendError(), JSONInterceptor, and DebuggingInterceptor.  (Other uses 
of devMode are related to logging and config reloading, and that shouldn't be 
adjustable.)

I've currently patched my copy of Struts 2.2.1 so each of the the 
above-mentioned code chunks checks an extra, static ThreadLocal variable that I 
added (in addition to the devMode member variable).

1)  Is this the best solution?
2)  Is this something that should be merged into the Struts 2 distribution?

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