SLING-3813 - Pax-Exam tests fail when executed under Java 8

Upgrade commons/classloader to use the latest versions of pax-exam,
pax-link and felix, removing use of deprecated APIs on the way.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615258 13f79535-47bb-0310-9956-ffa450edef68
SLING-3813 - Pax-Exam tests fail when executed under Java 8

Upgrade commons/log to use the latest versions of pax-exam,
pax-link and felix.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615259 13f79535-47bb-0310-9956-ffa450edef68