- Disallow setting wsrep_on = 1 if wsrep_provider is unset. Also, move
wsrep_on_basic from sys_vars to wsrep suite: this test now requires
to run with wsrep_provider set
- Disallow setting @@session.wsrep_on = 1 when @@global.wsrep_on = 0
- Handle the case where a new connection turns @@global.wsrep_on from
off to on. In this case we would miss a call to wsrep_open, causing
unexpected states in wsrep::client_state (causing assertions).
- Disable wsrep.
MDEV-22443 because it is no longer possible to enable
wsrep_on, if server is started with wsrep_provider='none'
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