BIND 10 #2095: Define and implement RdataEncoder class

[BIND 10 Development]

#2095: Define and implement RdataEncoder class
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120731
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  5
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 trac2095 is ready for review.

 The main and important change is to introduce the `RdataEncoder`
 class.  Test cases are adjusted, but the general idea of the tests
 are mostly the same.

 The idea of the `RdataEncoder` implementation is similar to
 `RdataFields` (in libdns++), so it maybe easier to review this branch
 if the reviewer knows some internals of the latter.

 I also provided some more detailed documentation of the encoding
 in general.

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Ticket URL: <http://bind10.isc.org/ticket/2095#comment:8>
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