Cleanup the ejb3/core cyclical dependencies on org.jboss.jbossas:main,system,system-jmx,mbeans,j2se

I've pointed org.jboss.jbossas:main,system,system-jmx,mbeans,j2se to the previous 5.0.0.Beta4
instead of 5.0.0-SNAPSHOT, to remove the snapshot dependency. This is what the other projects do (JBM, JBWS, etc.)

This always runs the risk of the core as libraries changing, so good integration testing is needed of ejb3 inside jbossAS.

Long term we want to:

1) review the dependency on those libraries and remove those that are not really necessary
2) create a proper SPI for the dependencies we cannot avoid.

This could be done post AS5 so I'm creating this as a reminder task.