BIND 10 #1839: specialize BasicRRset::toWire() for higher performance

[BIND 10 Development]

#1839: specialize BasicRRset::toWire() for higher performance
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  high          |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20131015
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  3             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:  auth
                                     |  performance
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by muks):

 * priority:  medium => high
 * status:  new => reviewing
 * milestone:   => Sprint-20131015


Comment:

 Up for review.

 * Jinmei's patch was adapted
 * Bogus toWire() unittests were fixed that masked problems in code. This
 bad code was also fixed.
 * `toWire()` code was also rewritten to use the specialized superclass
 implementation instead of directly calling rendering code.

 Up for review. Raising priority slightly.

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Ticket URL: <http://bind10.isc.org/ticket/1839#comment:2>
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