MDEV 13679 Enabled sequences to be used in DEFAULT

Other changes done to get this to work:
- Added 'internal_tables' to TABLE object to list which sequence tables
  is needed to use the table.
- Mark any expression using DEFAULT() with LEX->default_used.
  This is needed when deciding if we should open internal sequence
  tables when a table is opened (we don't need to open sequence tables
  if the main table is only used with SELECT).
- Create_and_open_temporary_table() can now also open all internal
  sequence tables.
- Added option MYSQL_LOCK_USE_MALLOC to mysql_lock_tables()
  to force memory allocation to be used with malloc instead of
  memroot.
- Added flag to MYSQL_LOCK to remember if allocation was done with
  malloc or memroot (makes code simpler and safer).
- init_one_table_for_prelocking() now takes argument for what lock to
  use instead of it's a routine or something else.
- Renamed prelocking placeholders to make them more understandable as
  they are now used in more code.
- Changed test in check_lock_and_start_stmt() if found table has correct
  locks. The old test didn't work for tables that has lock
  TL_WRITE_ALLOW_WRITE, which is what sequence tables are using.
- Added VCOL_NOT_VIRTUAL option to ensure that sequence functions can't
  be used with virtual columns
- More sequence tests

mysql-test/suite/sql_sequence/replication.test

@@ -851,6 +851,28 @@ select next value for s1, cycle_count from s1;
 select next value for s1, cycle_count from s1;
 drop sequence s1;
 
+--echo ###########################################
+--echo test default()
+--echo ###########################################
+connection master;
+
+CREATE SEQUENCE s1 nocache engine=myisam;
+CREATE table t1 (a int default next value for s1, b int);
+insert into t1 (b) values (1),(2);
+select default(a) from t1;
+select * from t1;
+select * from s1;
+--sync_slave_with_master
+connection s_normal_3;
+select * from t1;
+select * from s1;
+connection master;
+drop table t1,s1;
+
+#
+# Cleanup
+#
+
 connection master;
 drop database s_db;
 drop user normal_1@'%';