BIND 10 #1883: define tp_hash for some basic isc.dns classes

[BIND 10 Development]

#1883: define tp_hash for some basic isc.dns classes
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  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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 In our Python wrappers tp_hash are generally (if not always) NULL,
 so we cannot use our C++ based Python classes with python hash
 naturally.  It's inconvenient, and could also cause performance
 issues.

 I propose defining tp_hash for some basic classes like isc.dns.Name,
 isc.dns.RRType, and isc.dns.RRClass.  For the latter two the hash
 should be trivial.  For name, we can use a hash function defined in
 `LabelSequence`.

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Ticket URL: <http://bind10.isc.org/ticket/1883>
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