BIND 10 #2498: support generic version of rdata::createRdata(text) in HINFO and NAPTR

[BIND 10 Development]

#2498: support generic version of rdata::createRdata(text) in HINFO and NAPTR
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  low           |                       Status:  new
           Component:  libdns++      |                    Milestone:
            Keywords:                |  Sprint-20121218
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  3             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Description changed by jinmei:

Old description:

> Subtask of #2368, depend on #2374.
>
> See #2382.
>
> Also see #2442.  We should use the helper `strToCharstring()`
> function.  Also the internal data type for char-string should be
> changed to `CharString` (std::string is not appropriate as char-string
> can contain 8-bit values larger than 127).
>
> Once implemented, update the hardcode list introduced in
> #2497.

New description:

 Subtask of #2368, depend on #2374.

 See #2382.

 Also see #2442.  We should use the helper `strToCharstring()`
 function.  Also the internal data type for char-string should be
 changed to `CharString` (std::string is not appropriate as char-string
 can contain 8-bit values larger than 127).

 Once implemented, update the hardcode list introduced in
 #2497.

 There are existing functions handling character strings
 (lib/dns/character_string.cc).  These (and their tests) should be
 deprecated with this ticket.

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Ticket URL: <http://bind10.isc.org/ticket/2498#comment:2>
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