Since now a node that is at one point was marked as dead, either via
--ignore-dead-nodes parameter or by been a target for removenode or
replace, can no longer be made "undead" we need to make sure that they
cannot rejoin the cluster any longer. Do that by banning them on a
messaging layer just like we do for nodes that are left.
Not that the removenode failure test had to be altered since it restarted
a node after removenode failure (which now will not work). Also, since
the check for liveness was removed from the topology coordinator (because
the node is already banned by then), the test case that triggers the
removed code is removed as well.
Allows selectively enabling higher logging levels for just raft-topology
related things, without doing it for the entire storage_service (which
includes things like gossiper callbacks).
Also gets rid of the redundant "raft topology:" prefix which was also
not included everywhere.
We add a test for the Raft-based topology's new feature - rejecting
the removenode operation on the topology coordinator side if the
node being removed is considered alive by the failure detector.
Additionally, the test tests a case when the removenode operation
is rejected on the initiator side.
