Author: dram.wang
Description:
As described in manual[1], $wgUpgradeKey should be commented, but LocalSettings.php generated by 1.22.1 installer leaves it uncommented.
Not sure about the behaviour in master and other versions.
[1] http://www.mediawiki.org/wiki/Manual:$wgUpgradeKey
Version: 1.22.1
Severity: normal
URL: https://www.mediawiki.org/wiki/Manual:$wgUpgradeKey