BIND 10 #2656: support generic version of rdata::createRdata(text) in CNAME, DNAME, SRV

[BIND 10 Development]

#2656: support generic version of rdata::createRdata(text) in CNAME, DNAME, SRV
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            Reporter:  jelte         |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130205
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  4             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by muks):

 * owner:  muks => UnAssigned
 * status:  assigned => reviewing


Comment:

 I'm putting this one to review. But please read the comments below as I
 have questions (similar to questions for #2390):

 * The description asks to update tests in
 `src/bin/loadzone/tests/correct/`, but upon reading it, I wonder why these
 were not enabled before. Would it not have worked with the "old" method
 that used the string constructor?
 * Currently, any exceptions in the lexer are propagated. Would these have
 to be caught and changed to `InvalidRdataText` exceptions? I have to ask
 because the meta ticket and this ticket's description are very terse and
 don't explain much.
 * Does this require a `ChangeLog` entry?
 * There are tests already which were created by an older ticket that used
 the "old" method (as switched in `gen-rdatacode.py`).

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Ticket URL: <http://bind10.isc.org/ticket/2656#comment:3>
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