[Checkins] [zopefoundation/ZEO] 2d7987: Don't pickle errors.

[GitHub]

  Branch: refs/heads/dont-pickle-errors
  Home:   https://github.com/zopefoundation/ZEO
  Commit: 2d7987685dc3fc2791c2950e822772d6e79aab84
      https://github.com/zopefoundation/ZEO/commit/2d7987685dc3fc2791c2950e822772d6e79aab84
  Author: Jim Fulton <jim at zope.com>
  Date:   2016-08-05 (Fri, 05 Aug 2016)

  Changed paths:
    M src/ZEO/Exceptions.py
    M src/ZEO/asyncio/client.py
    M src/ZEO/asyncio/server.py

  Log Message:
  -----------
  Don't pickle errors.

Don't send errors as pickles. Send error names and class dict or arguments.

This is a step toward eliminating instance pickles from the ZEO protocol.

This is much messier than I'd like it to be because of the way both
python and ZEO handle exceptions.