Create 'main' test directory and move 't' and 'r' there

mysql-test/main/trans_read_only.test

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+--source include/not_embedded.inc
+
+--echo #
+--echo # WL#5968: Implement START TRANSACTION READ (WRITE|ONLY);
+--echo #
+
+--echo #
+--echo # Test9:  The --transaction-read-only startup option.
+
+--echo # Check that the option was set by the .opt file.
+SELECT @@tx_read_only;
+
+--echo # Also for new connections.
+connect (con1, localhost, root);
+SELECT @@tx_read_only;
+SET SESSION TRANSACTION READ WRITE;
+SELECT @@tx_read_only;
+disconnect con1;
+--source include/wait_until_disconnected.inc
+
+connection default;
+SELECT @@tx_read_only;
+
+
+--echo #
+--echo # Test 10: SET TRANSACTION / START TRANSACTION + implicit commit.
+
+SET SESSION TRANSACTION READ WRITE;
+--disable_ps_protocol
+SET TRANSACTION READ ONLY;
+--echo # Since DDL does implicit commit before starting, SET TRANSACTION
+--echo # will have no effect because the "next" transaction will already
+--echo # be over before the DDL statement starts.
+CREATE TABLE t1 (a INT);
+
+START TRANSACTION READ ONLY;
+--echo # The same happens with START TRANSACTION
+DROP TABLE t1;
+--enable_ps_protocol
+
+--echo #
+--echo # Test 11: INSERT DELAYED
+
+CREATE TABLE t1(a INT);
+START TRANSACTION READ ONLY;
+--error ER_CANT_EXECUTE_IN_READ_ONLY_TRANSACTION
+INSERT DELAYED INTO t1 VALUES (1);
+COMMIT;
+DROP TABLE t1;