BIND 10 #2518: introduce exception hierarchy for "from text" errors in libdns++

[BIND 10 Development]

#2518: introduce exception hierarchy for "from text" errors in libdns++
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            Reporter:  jinmei        |                        Owner:  muks
                Type:  task          |                       Status:
            Priority:  medium        |  reviewing
           Component:  libdns++      |                    Milestone:
            Keywords:                |  bind10-1.2-release-freeze
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
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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Comment (by muks):

 Note: Also update `MasterLoader` removing the generic `catch`.

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Ticket URL: <http://bind10.isc.org/ticket/2518#comment:5>
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