Trying to avoid resetting services introduces a lot of complexity and
several bugs. We were doing a reset for 70% of @group Database tests
anyway.
Instead:
* Reset services at the start of MediaWikiTestCase::run().
* Capture the actual original service container instead of making a
special shared service container.
* The test-isolated local service container can now only be initialised
non-statically. Revert the recent conversion of overrideMwServices()
to static.
* Store a reference to the local service container in the test case
object. In MediaWikiTestCase, always use the original or local service
container directly, to avoid confusion about which one is active at
the time.
* Remove a lot of unnecessary teardown
* Always call ServiceContainer::destroy() before forceGlobalInstance()
since the memory is not otherwise freed.
Change-Id: I4a17c1c7ec92c14e3bc471f0216473ebe19477b9
5322107191