BIND 10 #2266: remove RRsetList class

[BIND 10 Development]

#2266: remove RRsetList class
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  medium        |                       Status:  new
           Component:  libdns++      |                    Milestone:  Next-
           Sensitive:  0             |  Sprint-Proposed
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 i.e., just remove lib/dns/rrsetlist.h,cc and its tests.

 As far as I know the old data source implementation is the only user
 of this class, and the class interface is (IMO) quite confusing.  It's
 better gone.

 Depend on #2161.

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Ticket URL: <http://bind10.isc.org/ticket/2266>
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