BIND 10 #466: duplicate code in xfrout

[BIND 10 Development]

#466: duplicate code in xfrout
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  Reporter:  jinmei  |            Owner:                       
      Type:  defect  |           Status:  new                  
  Priority:  minor   |        Milestone:  y2 12 month milestone
 Component:  xfrout  |         Keywords:                       
 Sensitive:  0       |   Estimatedhours:  0                    
     Hours:  0       |         Billable:  1                    
Totalhours:  0       |         Internal:  0                    
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 XfroutSession._zone_is_empty() and XfroutSession._zone_exist() are
 essentially duplicate.  They do the same thing, and just return a negated
 value.

 We need some clarification or refactoring here.

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Ticket URL: <http://bind10.isc.org/ticket/466>
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