BIND 10 #2382: introduce generic version of rdata::createRdata(text)

[BIND 10 Development]

#2382: introduce generic version of rdata::createRdata(text)
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  jinmei
            Priority:  medium        |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20121218
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  5             |                 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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Comment (by jinmei):

 Thanks for the review.

 I've addressed all of them below, and made one additional small change
 (816eacf see the commit log and the change).  Please let me know if
 it's okay for merge or needs some more thing.

 Replying to [comment:10 jelte]:

 > rdata.h:
 >
 > There is a small error in the doxygen for the createRdata method:
 > 'it can use pass a callback that'
 > (I guess the 'use' should be removed)
 >
 > master_lexer.cc:
 >
 > In the Number::handle() method, the push_back('\0') calls could now be
 unified outside of the if-statement
 >
 >
 > rdata_unittest.cc:
 >
 > Suggestion for one more test: an rr with a comment at the end of the
 line,
 > e.g. aaaa_rdata.toText() << " ;comment"
 > To make sure comments are not treated as 'extra input'

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Ticket URL: <http://bind10.isc.org/ticket/2382#comment:11>
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