several fixes to make tests pass in embedded-server mode

mysql-test/t/flush_block_commit_notembedded.test

@@ -0,0 +1,32 @@
+# Let's see if FLUSH TABLES WITH READ LOCK blocks COMMIT of existing
+# transactions.
+# We verify that we did not introduce a deadlock.
+# This is intended to mimick how mysqldump and innobackup work.
+
+# And it requires InnoDB
+-- source include/not_embedded.inc
+-- source include/have_innodb.inc
+
+connect (con1,localhost,root,,);
+connect (con2,localhost,root,,);
+
+# FLUSH TABLES WITH READ LOCK should block writes to binlog too
+connection con1;
+create table t1 (a int) engine=innodb;
+reset master;
+set autocommit=0;
+insert t1 values (1);
+connection con2;
+flush tables with read lock;
+show master status;
+connection con1;
+send commit;
+connection con2;
+sleep 1;
+show master status;
+unlock tables;
+connection con1;
+reap;
+drop table t1;
+set autocommit=1;
+