Add some well-known boot delegation packages

Due to mechanics of class loading and class hiding and interactions with XML factory loading mechanisms it is required to add boot delegation for certain well-known packages when running sling in application servers:

1. JBoss XML factory package
   sling.bootdelegation.jboss=__redirected

1. Oracle WebLogic XML factory support
   sling.bootdelegation.weblogic=weblogic.xml.*

1. IBM WebSphere XML factory support
   sling.bootdelegation.ibm=com.ibm.xml.*