BIND 10 #1866: isc.dns constants like RRType.A() should be constants, not functions

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#1866: isc.dns constants like RRType.A() should be constants, not functions
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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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 In the C++ counterpart we intentionally define them via proxy
 functions like RRType::A() to avoid static initialization fiasco.
 But there's no such reason for the Python version, and using a
 function looks awkward (and would be less efficient).  These should be
 defined as normal constant in the C++ wrappers.

 Those include: `RRType`, `RRClass`, `Opcode`, and `Rcode` (and perhaps
 more).

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Ticket URL: <http://bind10.isc.org/ticket/1866>
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