Comment 4 for bug 1012138

The fix reads back the effective provider options from wsrep provider plugin, after a failed attempt to change options.
set gcs.fc_master_slave is not dynamic option, hence the failure in the SET command in the first place.

The fix is pushed in revision: http://bazaar.launchpad.net/~codership/codership-mysql/5.5-23/revision/3869