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
Implement purgeOnJoin

The joiner will still do the preload, but the entries will be removed from
the data container.

Also includes a fix for ISPN-3217 (entries not written to the cache store
on a backup owner with CACHE_MODE_LOCAL).

A hack was needed to avoid triggering ISPN-3443 (state transfer undoing the
remove operations).