BIND 10 #2439: update xfrin so it performs post transfer checks

[BIND 10 Development]

#2439: update xfrin so it performs post transfer checks
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  xfrin         |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130205
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  3             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by vorner):

 * owner:  vorner => UnAssigned
 * status:  accepted => reviewing


Comment:

 It is ready for review. As for changelog, this should do it:

 {{{
 [func]*         vorner
 The b10-xfrin now performs basic sanity check on just received zone.
 It'll reject severely broken zones (such as missing NS or SOA records).
 }}}

 There's some amount of mocking in the tests. Partly because I didn't find
 a way to create a class that'd inherit from the RRsetCollection class, it
 seems python doesn't agree on inheriting from a wrapper class.

-- 
Ticket URL: <https://bind10.isc.org/ticket/2439#comment:5>
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