Release 7.6.0: Upgrade to Hazelcast 3

[Guest]

The Hazelcast library is upgraded to the next major release. Due to the upgraded library, it's not possible to form a cluster of nodes running a previous version of Hazelcast, i.e. exiting volatile data in the cluster gets lost during the update.

This usually affects all user sessions that are stored in a distributed map, and will require the users to re-login after the update.