Updated mediawiki/extensions
Project: mediawiki/extensions/EventLogging  5abed10fce5122a6919b48a2fe13f9b159d42309
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Unit tests: test flatten(); better layout.

* Import all tests into tests/__init__.py
* Test deeply nested (i.e., two levels deep) properties
* Change test event property value to include code points outside
  ASCII range.
* Added test for eventlogging.schema.flatten.

Change-Id: Ief0ca25b0dd7c68551d9cfe3b22d2fd4bded152a