BIND 10 #141: review: some cleanups and minor bug fixes for xfrout

[BIND 10 Development]

#141: review: some cleanups and minor bug fixes for xfrout
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 Reporter:  jinmei        |        Owner:  zhanglikun
     Type:  defect        |       Status:  new       
 Priority:  minor         |    Milestone:            
Component:  Unclassified  |   Resolution:            
 Keywords:                |    Sensitive:  0         
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Comment(by jinmei):

 and please also review r1695.

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Ticket URL: <https://bind10.isc.org/ticket/141#comment:1>
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