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

Upgraded scripting/core to use more recent versions of pax-exam,
pax-link and felix.framework. Also switched to
pax-exam-container-forked, to avoid classpath conflicts when running the
tests.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615545 13f79535-47bb-0310-9956-ffa450edef68
SLING-3813 - Pax-Exam tests fail when executed under Java 8

Update jcr/it-jackrabbit-oak to use more recent versions of pax-exam,
pax-link and felix.framework.

Also removed com.google.code.findbugs:jsr305 from the bundle list, as it
is not a valid bundle and pax-exam now fails the test in such cases.

Also switched to the pax-exam-container-forked, to prevent classpath
conflicts.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615549 13f79535-47bb-0310-9956-ffa450edef68