[Checkins] [zopefoundation/ZConfig] 2c0e20: support arbitrary field names in format strings

[GitHub]

  Branch: refs/heads/fd-logger-arbitrary-fields
  Home:   https://github.com/zopefoundation/ZConfig
  Commit: 2c0e20bb69772c6d1379226b2f41cf9fcae45985
      https://github.com/zopefoundation/ZConfig/commit/2c0e20bb69772c6d1379226b2f41cf9fcae45985
  Author: Fred Drake <fred.drake at keepertech.com>
  Date:   2018-12-31 (Mon, 31 Dec 2018)

  Changed paths:
    M ZConfig/components/logger/formatter.py
    M ZConfig/components/logger/handlers.xml
    M ZConfig/components/logger/tests/test_formatter.py

  Log Message:
  -----------
  support arbitrary field names in format strings

allow a formatter to include references to unknown log record fields,
if the user explicity allows it

implements feature request from issue #53



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