Git commits in Moodle 2.4.3 by Sam Hemelryk

commit 95d3b8e1f20404b7a8e407361620b5ae3d4e71d7
Author: Sam Hemelryk <sam@moodle.com>
Date:   Fri, 08 Mar 2013 09:07:13 +0800
Tag:    v2.4.3

MDL-38387 cache: fixed inifinite initialisation loop with site id

commit d55276ee51fb09204022ef284ee30f683271814d
Author: Sam Hemelryk <sam@moodle.com>
Date:   Wed, 06 Mar 2013 06:41:46 +0800
Tag:    v2.4.3

MDL-38303 cache: fixed purging of session cache when switching users