SLING-3290 - Long startup time with many vanityPath

* split a method in two in order to improve extensibility  (no functional changes)

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615925 13f79535-47bb-0310-9956-ffa450edef68
SLING-3820 - minor fixes, temporarily removing jcr package creation from vlt package builder until it's fully working

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615932 13f79535-47bb-0310-9956-ffa450edef68