Java 9: Support fragment bundles in integration tests.
Java 9: Support fragment bundles in integration tests.

.. by opening package java.base/jdk.internal.loader
(See felix:ExtensionManager.addExtensionBundle)

vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa