Storing the user name or IP in every row in large tables like revision
and logging takes up space and makes operations on these tables slower.
This patch begins the process of moving those into one "actor" table
which other tables can reference with a single integer field.
A subsequent patch will remove the old columns.
Bug: T167246
Depends-On: I9293fd6e0f958d87e52965de925046f1bb8f8a50
Change-Id: I8d825eb02c69cc66d90bd41325133fd3f99f0226
This patch does two major things to the newly introduced
ApiQueryRecentChangesIntegrationTest:
* It rips the confusingly complicated assertArraySubsetsEqual appart.
* It removes all wikitext content. Note that no assertion is done on this
content (not even in the test that is about adding a category). The tests
run just fine with automatically generated content. I had to introduce the
$i counter to make sure consecutive edits are done with different content.
Otherwise the later edit is not stored.
Change-Id: Iae585be86f3fd9bff7d2b4b7b218d5b0b4258603
