[KARAF-2695] Upgrade to commons-codec 1.9
KARAF-2696 Refactoring to share common code between BundleRef and ConfigFileRef
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/karaf
Re-enable itests for feature shell command security ACL

Changed slightly to address spurious failure
[KARAF-2697] Upgrade to Aries Blueprint Core 1.4.0
Added test for KARAF-2696.
Adapted test to changes in model.