SLING-2944 Required Bundle Updates in the bundle list

* JCR API 2.1.1-SNAPSHOT (SlingRepository update)
* JCR Base 2.1.3-SNAPSHOT (AbstractSlingRepository)
* Service User Mapper (required Service)

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1510504 13f79535-47bb-0310-9956-ffa450edef68