BIND 10 #1574: Add support for loading NSEC3 RRsets to in memory data source

[BIND 10 Development]

#1574: Add support for loading NSEC3 RRsets to in memory data source
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  NSEC3
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 We use a separate storage for NSEC3 RR sets in the in memory data
 source.  That could even be a straightforward STL map<Name,
 (Const)RRsetPtr> (this is not efficient in terms of memory
 footprint, but should be okay for the initial implementation).

 For simplicity, I propose ensuring consistency of NSEC3 parameters
 at load time: As we add NSEC3s to that storage, check the hash
 algorithm, iteration, and salt are the same for all RRs.  At the end
 of loading check the existence of NSEC3PARAM RR at the apex, and
 check the parameters of NSEC3PARAM and of NSEC3 RRs are the same.
 Reject loading if these aren't met.

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Ticket URL: <http://bind10.isc.org/ticket/1574>
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BIND 10 Development