Move integration modules/packages out of OSGi subsystem config

Currently the org.jboss.osgi.system.modules property contains a number of logging components:

<property name="org.jboss.osgi.system.modules">
  org.apache.commons.logging,
  org.apache.log4j,
  org.jboss.as.osgi,
  org.slf4j,
</property>

It would be good to see if we can move these modules to the <modules> section of the configuration and load them as proper modules rather than having them merged with the system module.