BIND 10 #919: define a header file for DNS protocol constants

[BIND 10 Development]

#919: define a header file for DNS protocol constants
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            Reporter:  jinmei        |                        Owner:
                Type:  enhancement   |  jinmei
            Priority:  major         |                       Status:  new
           Component:  DNSPacket     |                    Milestone:  New
  API                                |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 See the discussion for the background:
 http://bind10.isc.org/ticket/893#comment:11
 (around the paragraph beginning with "OK, although...")

 The idea is to create a new header file, say, protocol_constants.h, in
 lib/dns to centrailze the definition of (mainly numeric) protocol
 constants
 such as the max wire length of domain names.

 We should begin with the discussion about whether this is a good idea
 in the first place, and, if so, which constants should be defined
 in that file.

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Ticket URL: <http://bind10.isc.org/ticket/919>
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