Adjust Galera disabled tests based on test results.

Author: Jan Lindström

mysql-test/suite/galera/disabled.def

@@ -25,18 +25,15 @@ galera_gcache_recover_full_gcache : MDEV-13549 Galera test failures
 galera_gcache_recover_manytrx : MDEV-13549 Galera test failures
 galera_ssl_upgrade : MDEV-13549 Galera test failures
 galera.MW-329 : wsrep_local_replays not stable
-query_cache : MDEV-15805 Test failure on galera.query_cache
 MW-416 : MDEV-13549 Galera test failures
 galera_wan : MDEV-13549 Galera test failures
 MW-388 : MDEV-13549 Galera test failures
 galera_sst_mysqldump_with_key : MDEV-16890 Galera test failure
 galera_binlog_stmt_autoinc: MDEV-17106 Test failure on galera.galera_binlog_stmt_autoinc
 galera_gc_fc_limit : MDEV-17061 Test failure on galera.galera_gc_fc_limit
-galera_applier_ftwrl_table_after : MDEV-13738 galera_applier_ftwrl_table_alter may fail with '2006: MySQL server has gone away'
 galra_unicode_identifiers: MDEV-13871 galera.galera_unicode_identifiers failed in buildbot with 'Unknown database'
 galera_suspend_slave: MDEV-13873 galera.galera_suspend_slave failed in buildbot with wrong error code
 galera_wan : MDEV-13879 galera.galera_wan fails in buildbot with Stray state UUID msg or with "Transport endpoint is not connected" or with a failure to start a node
 partition : MDEV-13881 galera.partition failed in buildbot with wrong result
-galera_transaction_read_only : MDEV-14142 galera.galera_transaction_read_only fails in buildbot with wrong result
 galera_as_slave_replication_budle : MDEV-15785 Test case galera_as_slave_replication_bundle caused debug assertion