Remove JGroups from multi-site

JGroups relies on multi-cast on UDP which would
never work on multi-site synchronization.

There is the option to use TCP, however multicast
implementation over TCP is not efficient and would
require some complex gateway/firewall setups.

Automatic setup of another node with Groups is
not needed either.

Change-Id: I4d644b620f7a3f76c2c80e4d46782d4c977e515c
15 files changed