Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  6ec518a60343303f98cde7cc9297de6e2f087846

QA: refactor to get rid of sleep

There is a test step called "the page has re-rendered" that
is only a 10-second sleep call. This step is called almost 20 times
in the suite, and is used for different purposes.

Removing the sleep will greatly improve the run time and also make
the suite more reliable and easier to work with in the future

Change-Id: I0e8ae3780370cb0fd3510a16d026715a425e7b4b