BIND 10 #2164: introduce RRset::getSIGRdataCount()

[BIND 10 Development]

#2164: introduce RRset::getSIGRdataCount()
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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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 This is one building block of #2163.  It's similar to getRdataCount(),
 but works on the stored RRSIG (if any), i.e., returns the number of
 RRSIG RRs associated with the `RRset`.  If no RRSIG is attached,
 it will return 0.

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Ticket URL: <http://bind10.isc.org/ticket/2164>
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