Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceFoundation  c955e06165213af9b8910c0be9a5396d81cd8312

Config class change for preferences
added method in config class to reduce code for preferences
small fix in shm cache class

Change-Id: I89cc5f2a18e748bdff9c1f39e9f95c3a9cd09f8d