ISPN-4301 Handle storeMetadata=false in JpaStore.process and JpaStore.purge methods
ISPN-4301 Fixing process() behaviour in other stores (honor the fetchValue & fetchMetadata properly)
ISPN-4636 Upgrade to Hibernate Search 5.0.0.Alpha6
ISPN-4461 Add VERIFY_SUSPECT back in JGroups UDP stack
ISPN-4446 Signal components of cache removal

* Since stop() takes no parameters, make the remove cache command
signal components of cache removal before cache stop, so that they can
do their job.