fix embedded tests

(mainly by backporting 5.5. changes)

mysql-test/suite/maria/t/distinct.test:
  Remove the test that requires SSL. One test case for a bug is enough.
sql/scheduler.cc:
  make it the same as in 5.5
storage/innodb_plugin/row/row0mysql.c:
  make it the same as in 5.5
storage/innodb_plugin/row/row0sel.c:
  make it the same as in 5.5
storage/xtradb/row/row0mysql.c:
  make it the same as in 5.5
storage/xtradb/row/row0sel.c:
  make it the same as in 5.5

mysql-test/suite/maria/r/distinct.result

@@ -15,11 +15,3 @@ GROUP_CONCAT(a)
 3
 1
 DROP TABLE t1;
-CREATE TABLE t1 (a INT, b VARCHAR(1)) ENGINE=MyISAM;
-INSERT INTO t1 VALUES (7,'q'),(2,NULL),(7,'g'),(6,'x');
-SELECT DISTINCT MAX( a ) FROM t1 GROUP BY b ORDER BY DES_DECRYPT( b );
-MAX( a )
-2
-7
-6
-DROP TABLE t1;

mysql-test/suite/maria/t/distinct.test

@@ -19,7 +19,3 @@ SELECT GROUP_CONCAT(a) FROM t1 GROUP BY b;
 SELECT DISTINCT GROUP_CONCAT(a) FROM t1 GROUP BY b;
 DROP TABLE t1;
 
-CREATE TABLE t1 (a INT, b VARCHAR(1)) ENGINE=MyISAM;
-INSERT INTO t1 VALUES (7,'q'),(2,NULL),(7,'g'),(6,'x');
-SELECT DISTINCT MAX( a ) FROM t1 GROUP BY b ORDER BY DES_DECRYPT( b );
-DROP TABLE t1;

sql/scheduler.cc

@@ -69,7 +69,6 @@ static bool no_threads_end(THD *thd, bool put_in_cache)
 void one_thread_scheduler(scheduler_functions *func)
 {
   func->max_threads= 1;
-  max_connections= 1;
   func->max_connections= &max_connections;
   func->connection_count= &connection_count;
 #ifndef EMBEDDED_LIBRARY

storage/innodb_plugin/row/row0mysql.c

@@ -1079,7 +1079,6 @@ row_insert_for_mysql(
 	ins_node_t*	node		= prebuilt->ins_node;
 
 	ut_ad(trx);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 
 	if (prebuilt->table->ibd_file_missing) {
 		ut_print_timestamp(stderr);
@@ -1313,7 +1312,6 @@ row_update_for_mysql(
 	trx_t*		trx		= prebuilt->trx;
 
 	ut_ad(prebuilt && trx);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 	UT_NOT_USED(mysql_rec);
 
 	if (prebuilt->table->ibd_file_missing) {
@@ -1483,7 +1481,6 @@ row_unlock_for_mysql(
 	trx_t*		trx		= prebuilt->trx;
 
 	ut_ad(prebuilt && trx);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 
 	if (UNIV_UNLIKELY
 	    (!srv_locks_unsafe_for_binlog
@@ -2724,7 +2721,6 @@ row_truncate_table_for_mysql(
 	redo log records on the truncated tablespace, we will assign
 	a new tablespace identifier to the truncated tablespace. */
 
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 	ut_ad(table);
 
 	if (srv_created_new_raw) {

storage/innodb_plugin/row/row0sel.c

@@ -3434,7 +3434,6 @@ row_search_for_mysql(
 	rec_offs_init(offsets_);
 
 	ut_ad(index && pcur && search_tuple);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 
 	if (UNIV_UNLIKELY(prebuilt->table->ibd_file_missing)) {
 		ut_print_timestamp(stderr);

storage/xtradb/row/row0mysql.c

@@ -1084,7 +1084,6 @@ row_insert_for_mysql(
 	ins_node_t*	node		= prebuilt->ins_node;
 
 	ut_ad(trx);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 
 	if (prebuilt->table->ibd_file_missing) {
 		ut_print_timestamp(stderr);
@@ -1326,7 +1325,6 @@ row_update_for_mysql(
 	trx_t*		trx		= prebuilt->trx;
 
 	ut_ad(prebuilt && trx);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 	UT_NOT_USED(mysql_rec);
 
 	if (prebuilt->table->ibd_file_missing) {
@@ -1497,7 +1495,6 @@ row_unlock_for_mysql(
 	trx_t*		trx		= prebuilt->trx;
 
 	ut_ad(prebuilt && trx);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 
 	if (UNIV_UNLIKELY
 	    (!srv_locks_unsafe_for_binlog
@@ -2830,7 +2827,6 @@ row_truncate_table_for_mysql(
 	redo log records on the truncated tablespace, we will assign
 	a new tablespace identifier to the truncated tablespace. */
 
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 	ut_ad(table);
 
 	if (srv_created_new_raw) {

storage/xtradb/row/row0sel.c

@@ -3435,7 +3435,6 @@ row_search_for_mysql(
 	rec_offs_init(offsets_);
 
 	ut_ad(index && pcur && search_tuple);
-	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 
 	if (UNIV_UNLIKELY(prebuilt->table->ibd_file_missing)) {
 		ut_print_timestamp(stderr);