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:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130122
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  3             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by jelte):

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


Comment:

 Ready for review.

 The diff may be slightly larger than you'd expect, since changing the
 internal format touches nearly everything in these files.

 Also it meant a few API changes; I added some common function to
 char_string.[cc|h], and the getCPU() methods etc that used to return a
 string reference now return a string copy.

 Also these classes now use pimpl.

 Both of these are because CharString is an 'internal' class (in ::detail);
 TBH I think we should seriously consider making it a public class.

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Ticket URL: <http://bind10.isc.org/ticket/2498#comment:5>
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