Fixed JERSEY-2687.

- The MetainfServicesAutoDiscoverable class was in the o.g.j.message.internal package, which has confused the maven-bundle-plugin and has caused that all the Jersey core classes from this package have been bundled as part of the extension jar. The fix moves the extension sources to a new separate internal package, as there should not be multiple jars with classes in the same package anyway.

Change-Id: Icb64deb66fa65e00a6b6f7bc530477457384f9aa
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Merge "Fixed JERSEY-2687."