Replace dnspython with our own SRV dns implementation

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    • Type: Epic
    • Resolution: Won't Fix
    • Priority: Major - P3
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    • Affects Version/s: None
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    • Replace dnspython
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      Epic Summary

      Summary
      Replace dnspython with our own SRV dns implementation.

      Motivation
      mongodb+srv:// URIs require SRV dns lookups. Currently pymongo (and motor) require the dnspython library to be installed. This causes user pain because dnspython is not installed by default (see MOTOR-706 and PYTHON-2605).

      dnspython also brings its own problems as described in PYTHON-2362, PYTHON-2002, and PYTHON-2364.

      Instead we should implement the required DNS logic ourselves and drop the dnspython dependency.

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      [Scope Document|some.url]
      [Technical Design Document|some.url]

            Assignee:
            Unassigned
            Reporter:
            Shane Harvey
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