BIND 10 #3298: Use shared_ptr instead of auto_ptr in RDATA parsers

[BIND 10 Development]

#3298: Use shared_ptr instead of auto_ptr in RDATA parsers
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                   Reporter:  muks   |                 Owner:  UnAssigned
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  libdns++                           |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Use `shared_ptr` intead of `auto_ptr` in RDATA parsers in `libdns++`. This
 will remove the use of `delete` and make the code safer as well.

 Do this after #2512 (CAA), #2185 (TLSA) and #2426 (generic) are merged to
 master.

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Ticket URL: <http://bind10.isc.org/ticket/3298>
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