BIND 10 #2151: well known "wildcard" LabelSequence

[BIND 10 Development]

#2151: well known "wildcard" LabelSequence
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:  new
           Component:  libdns++      |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  scalable inmemory
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Mainly for #2110, I guess we'd find it convenient if we have a
 pre-defined `LabelSequence` object for a non absolute single-label
 sequence of `*`, just like `Name::ROOT_NAME()`.

 So this ticket is to just define and implement something like
 `LabelSequence::WILDCARD_LABEL()`.

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Ticket URL: <http://bind10.isc.org/ticket/2151>
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