Fixed pax exam tests and fuse esb startup 

This pull request contains fixes for two major issues/bugs 

1) fuse esb test did work and were totally disabled. Ref FABRIC-520
+ I had to update pax-exam to 3.2.0 and refactor some of pom.xml files 
+ added bootDelegationPackage("org.osgi.framework") to EsbTestSupport with detailed description

2) Commits around Sept 23 brought in dependency on org.osgi.compendium to fabric packages, however org.osgi.compendium bundle were not properly imported, as a result of this fuse esb would not install fabric feature 
+ added org.osgi.compendium bundle to "fabric" feature