ISPN-5024 Generate META-INF and blueprint services automatically

Fix Maven errors in Eclipse:
"Error(s) found in manifest configuration (org.apache.felix:maven-bundle-plugin:2.4.0:bundle:default-bundle:package)"

Caused by Include-Resource entries which are missing (they are generated using the 'script' goal of the maven-scala-plugin
when triggering Maven from the command line but this goal is not triggered in Eclipse and the resources are not created).
ISPN-5040 Upgrade to JGroups 3.6.1.
- Drop DISCARD2
- Use resend_last_seqno="true" in NAKACK2
Revert "Revert rebalancing per cache"

This reverts commit 8cbba22ae625c7dd3e8f5ff389b71f4b49aec2b4.