MDEV-9312: storage engine not enforced during galera cluster replication

Perform a post initialization of plugin-related variables
of wsrep threads after their global counterparts have been
initialized.

mysql-test/suite/galera/r/enforce_storage_engine2.result

@@ -0,0 +1,24 @@
+#
+# MDEV-9312: storage engine not enforced during galera cluster
+# replication
+#
+CREATE TABLE t1(i INT) ENGINE=INNODB;
+CREATE TABLE t2(i INT) ENGINE=MYISAM;
+Warnings:
+Note	1266	Using storage engine InnoDB for table 't2'
+SHOW TABLES;
+Tables_in_test
+t1
+t2
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `i` int(11) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+DROP TABLE t1, t2;
+# End of tests

mysql-test/suite/galera/t/enforce_storage_engine2.opt

@@ -0,0 +1,2 @@
+--enforce_storage_engine=innodb --sql_mode=''
+

mysql-test/suite/galera/t/enforce_storage_engine2.test

@@ -0,0 +1,20 @@
+--source include/galera_cluster.inc
+--source include/have_innodb.inc
+
+--echo #
+--echo # MDEV-9312: storage engine not enforced during galera cluster
+--echo # replication
+--echo #
+--connection node_1
+CREATE TABLE t1(i INT) ENGINE=INNODB;
+CREATE TABLE t2(i INT) ENGINE=MYISAM;
+
+--connection node_2
+SHOW TABLES;
+SHOW CREATE TABLE t1;
+SHOW CREATE TABLE t2;
+
+# Cleanup
+DROP TABLE t1, t2;
+
+--echo # End of tests