BIND 10 #2427: support $ORIGIN in dns::MasterLoader

[BIND 10 Development]

#2427: support $ORIGIN 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):

 Please also include the handling of initial whitespace to mean the
 previous name, like in:
 {{{
 www.example.com. IN AAAA 2001:db8::1
                  IN A 192.0.2.1 ; the same owner name, omitted
 }}}

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Ticket URL: <https://bind10.isc.org/ticket/2427#comment:2>
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