Integrate/Enable CodeRecommenders substring completion in JBDS 10

Eclipse Mars release are shipped with CodeRecommenders enabled so that Java developers can benefit from substring completion and many others: https://www.eclipse.org/recommenders/manual/
JBDS doesn't have it enabled by default when installing from installer. Since it provides a lot of value for Java developers, it should be on by default.

Project page/sources: https://www.eclipse.org/recommenders/manual/
Version: 2.2.4 (part of Mars)
License and owner: EPL, Eclipse Community/CodeTrails
Original p2 repo: included in Mars repository
JBoss mirror: will use our Mars mirror
Include Sources: No
Affected JBoss Tools components: JBDS feature and product
Include in JBDS: Yes (only, not in JBT as it's supposed to be available in upstream Eclipse)
Type of dependency: distribution
List of bundles added/removed:
p2diff.log.txt