BIND 10 #2429: support $TTL and TTL guessing in dns::MasterLoader

[BIND 10 Development]

#2429: support $TTL and TTL guessing in dns::MasterLoader
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       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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Comment (by vorner):

 Whoever takes this task might want to have a look (and base the work on)
 the
 commit 398a65223150685c4d022dd980d0292e8116afb1 of #2428. This is the
 generic
 $DIRECTIVE switch, and it'll minimize conflicts.

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Ticket URL: <http://bind10.isc.org/ticket/2429#comment:2>
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