BIND 10 #2383: add dns::Name constructor to be usable from MasterLoader

[BIND 10 Development]

#2383: add dns::Name constructor to be usable from MasterLoader
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20121106
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  libdns++                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  4
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  loadzone-ng                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by jelte):

 * owner:  jelte => jinmei


Comment:

 In general it looks ok, some minor points below:

 - ft_at in name.cc:130 has a comment that it is not used, but it is used
 (at least in the code below)
 - regarding @, should input like '@foo' be accepted (how lenient do we
 want to be)? and if not, do we fail here or in the lexer? (looks like the
 current implementation would drop all text after the @-sign, if it gets
 here), this may also be related to requirements section 3.7.3 (soa rname
 with @)

 - wild idea (and totally offtopic, should maybe have though of this
 earlier): perhaps we'll want to warn if the name is not absolute, but does
 appear to end with the origin. This is like the second most often made
 mistake in editing zone files (forgetting the ., the first being not
 updating soa serial). Of course, apart from whether we want to do this in
 the first place, name.cc is probably not the place to do so.

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Ticket URL: <http://bind10.isc.org/ticket/2383#comment:5>
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