Core Galleon feature-pack pom.xml should define deps as provided

When referencing WildFly core FP as a maven dependency all the dependencies are pulled by maven although they are not required. By making them "provided", the dependencies versions are retrieved when building core feature-pack but dependencies are not downloaded when referencing WildFly core feature-pack.

NB: This implies an upgrade to Galleon 4 for the Galleon plugin to properly retrieve the dependencies versions.