BIND 10 #450: a few cleanup/correction to the new query logic with memory data source

[BIND 10 Development]

#450: a few cleanup/correction to the new query logic with memory data source
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  Reporter:  jinmei    |            Owner:  jinmei               
      Type:  defect    |           Status:  new                  
  Priority:  major     |        Milestone:  y2 12 month milestone
 Component:  b10-auth  |         Keywords:                       
 Sensitive:  0         |   Estimatedhours:  0                    
     Hours:  0         |         Billable:  1                    
Totalhours:  0         |         Internal:  0                    
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 - we should return REFUSED (as opposed to SERVFAIL) when we cannot find a
 matchign zone as we discussed at the bind10-dev list
  - we shouldn't use the meory data source unless the query class is IN
 (which is the only supported class at the moment)
  - the "NXRRSET" result of Zone::find() should actually result in
 "NOERROR" rcode in the response (NXRRSET is dynamic update specific)

 I'm going to submit a proposed fix.

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Ticket URL: <http://bind10.isc.org/ticket/450>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development