BIND 10 #2497: introduce wrapper version of "from lexer" rdata factory

[BIND 10 Development]

#2497: introduce wrapper version of "from lexer" rdata factory
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  jinmei
            Priority:  medium        |                       Status:
           Component:  libdns++      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20121204
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  0             |                 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):

 Replying to [comment:24 muks]:

 > > So, for example, if we have ('xxx', 'generic') in
 new_rdata_factory_users,
 > > we need to handle the case of ('xxx', 'in'), too.  One easy way to
 > > just clarify it in the comment (after all this is temporary
 > > workaround).  Another is to handle it automatically in
 generate_rrparam().
 >
 > I've updated the code to handle this, and also verified it with a
 `[('soa', 'generic')]` sample list, which also applies it to the `('soa',
 'in')` case.

 Change looks okay, but not very readable (and one line is too long).
 I've committed a suggested fix to that.  I also added one example
 for the 'generic' class.

 HINFO changes seem overkill (we'll soon discard them anyway), but
 don't look incorrect so I'm okay with them.

 So, if the suggested changes to the script are okay please merge.

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Ticket URL: <http://bind10.isc.org/ticket/2497#comment:26>
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