Add a basic MTR test for DDL error voting to ensure that all DDLs

generate consistent error messages,
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>

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

+connection node_2;
+connection node_1;
+connection node_1;
+SET @@global.wsrep_ignore_apply_errors = 7;
+connection node_2;
+SET @@global.wsrep_ignore_apply_errors = 7;
+connection node_1;
+CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY);
+connection node_1;
+DROP TABLE nonexistent;
+ERROR 42S02: Unknown table 'test.nonexistent'
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+TRUNCATE TABLE nonexistent;
+ERROR 42S02: Table 'test.nonexistent' doesn't exist
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+CREATE TABLE nonexistent.t1 (s INT);
+ERROR 42000: Unknown database 'nonexistent'
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+CREATE TABLE t1 (s INT);
+ERROR 42S01: Table 't1' already exists
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+ALTER TABLE nonexistent ADD COLUMN (c INT);
+ERROR 42S02: Table 'test.nonexistent' doesn't exist
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+DROP TABLE t1;
+connection node_1;
+SET @@global.wsrep_ignore_apply_errors = 0;
+connection node_2;
+SET @@global.wsrep_ignore_apply_errors = 0;
+connection node_1;
+CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY);
+connection node_1;
+DROP TABLE nonexistent;
+ERROR 42S02: Unknown table 'test.nonexistent'
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+TRUNCATE TABLE nonexistent;
+ERROR 42S02: Table 'test.nonexistent' doesn't exist
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+CREATE TABLE nonexistent.t1 (s INT);
+ERROR 42000: Unknown database 'nonexistent'
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+CREATE TABLE t1 (s INT);
+ERROR 42S01: Table 't1' already exists
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+connection node_1;
+ALTER TABLE nonexistent ADD COLUMN (c INT);
+ERROR 42S02: Table 'test.nonexistent' doesn't exist
+INSERT INTO t1 VALUES (DEFAULT);
+connection node_2;
+DROP TABLE t1;
+connection node_1;
+SET @@global.wsrep_ignore_apply_errors = 7;
+connection node_2;
+SET @@global.wsrep_ignore_apply_errors = 7;

mysql-test/suite/galera/t/galera_vote_ddl.inc

+--connection node_1
+CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY);
+
+--connection node_1
+--error 1051
+DROP TABLE nonexistent;
+
+# Verify cluster is intact
+INSERT INTO t1 VALUES (DEFAULT);
+--connection node_2
+--let $wait_condition = SELECT COUNT(*) = 1 FROM t1;
+--source include/wait_condition.inc
+
+--connection node_1
+--error 1146
+TRUNCATE TABLE nonexistent;
+
+# Verify cluster is intact
+INSERT INTO t1 VALUES (DEFAULT);
+--connection node_2
+--let $wait_condition = SELECT COUNT(*) = 2 FROM t1;
+--source include/wait_condition.inc
+
+--connection node_1
+--error 1049
+CREATE TABLE nonexistent.t1 (s INT);
+
+# Verify cluster is intact
+INSERT INTO t1 VALUES (DEFAULT);
+--connection node_2
+--let $wait_condition = SELECT COUNT(*) = 3 FROM t1;
+--source include/wait_condition.inc
+
+--connection node_1
+--error 1050
+CREATE TABLE t1 (s INT);
+
+# Verify cluster is intact
+INSERT INTO t1 VALUES (DEFAULT);
+--connection node_2
+--let $wait_condition = SELECT COUNT(*) = 4 FROM t1;
+--source include/wait_condition.inc
+
+--connection node_1
+--error 1146
+ALTER TABLE nonexistent ADD COLUMN (c INT);
+
+# Verify cluster is intact
+INSERT INTO t1 VALUES (DEFAULT);
+--connection node_2
+--let $wait_condition = SELECT COUNT(*) = 5 FROM t1;
+--source include/wait_condition.inc
+
+DROP TABLE t1;

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

+#
+# Test voting on identical DDL errors (error messages should match)
+#
+
+--source include/galera_cluster.inc
+--source include/have_binlog_format_row.inc
+
+#
+# 1. Ignore all DDL errors (avoids voting)
+#
+--connection node_1
+--let $wsrep_ignore_apply_errors_saved1 = `SELECT @@global.wsrep_ignore_apply_errors`
+SET @@global.wsrep_ignore_apply_errors = 7;
+--connection node_2
+--let $wsrep_ignore_apply_errors_saved2 = `SELECT @@global.wsrep_ignore_apply_errors`
+SET @@global.wsrep_ignore_apply_errors = 7;
+
+--source galera_vote_ddl.inc
+
+#
+# 2. Don't ignore any errors (forces voting)
+#
+--connection node_1
+SET @@global.wsrep_ignore_apply_errors = 0;
+--connection node_2
+SET @@global.wsrep_ignore_apply_errors = 0;
+
+--source galera_vote_ddl.inc
+
+--connection node_1
+--eval SET @@global.wsrep_ignore_apply_errors = $wsrep_ignore_apply_errors_saved1
+
+--connection node_2
+--eval SET @@global.wsrep_ignore_apply_errors = $wsrep_ignore_apply_errors_saved2