BIND 10 #358: more cleanup for the message class

[BIND 10 Development]

#358: more cleanup for the message class
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      Reporter:  jinmei         |        Owner:  UnAssigned           
          Type:  task           |       Status:  reviewing            
      Priority:  major          |    Milestone:  y2 12 month milestone
     Component:  DNSPacket API  |   Resolution:                       
      Keywords:                 |    Sensitive:  0                    
Estimatedhours:  0.0            |        Hours:  0                    
      Billable:  1              |   Totalhours:  0                    
      Internal:  0              |  
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Comment(by jinmei):

 I made a few more changes assuming no one had started review (r3130).

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Ticket URL: <https://bind10.isc.org/ticket/358#comment:2>
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