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:  jinmei               
      Type:  task           |           Status:  new                  
  Priority:  major          |        Milestone:  y2 12 month milestone
 Component:  DNSPacket API  |         Keywords:                       
 Sensitive:  0              |   Estimatedhours:  0                    
     Hours:  0              |         Billable:  1                    
Totalhours:  0              |         Internal:  0                    
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 This is a next round of DNS message class cleanups.  I plan to change
 header flags and message sections from separete user defined classes to
 enumerates, considering the balance between type safety and usability.  I
 also add more detailed tests and documentation for these.

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Ticket URL: <https://bind10.isc.org/ticket/358>
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BIND 10 Development