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wfWarn() should cause phpunit tests to fail.

Description

wfWarn() should cause phpunit tests to fail.

This forces $wgDevelopmentWarnings to true for phpunit tests.

Note that wfWarn uses the E_USER_NOTICE level per default, which may or may not
actually cause test cases to fail, depending on the phpunit configuration.

Change-Id: I36583fb063436cc8474873b468fc983d28377cbd