SLING-3049 - Make Logback Stacktrace Packaging data support OSGi aware

Disabling the PackagingDataCalculator support in OSGi as current logic of estimating class would not work properly in OSGi env

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1550694 13f79535-47bb-0310-9956-ffa450edef68